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This article is about the beverage. For other uses, see Tea (disambiguation).

Tea
Tea leaves steeping in zhong caj
Oolong tea being infused in a gaiwan
TypeHot or cold beverage
Country of origin China[1]
IntroducedApprox. 10th century BC (earliest written records)[2]
Tea plant (Camellia sinensis) from Köhler's Medicinal Plants
Camellia sinensis

Tea is an aromatic beverage commonly prepared by pouring hot or boiling water over cured leaves of the tea plant, Camellia sinensis.[3] After water, tea is the most widely consumed beverage in the world.[4] It has a cooling, slightly bitter, and astringent flavour that many people enjoy.[5]

Tea likely originated in China as a medicinal drink.[6] It was first introduced to Portuguese priests and merchants in China during the 16th century.[7] Drinking tea became popular in Britain during the 17th century. The British introduced it to India, in order to compete with the Chinese monopoly on the product.[8]

Tea has long been promoted for having a variety of positive health benefits. Recent studies suggest that green tea may help reduce the risk of cardiovascular disease and some forms of cancer, promote oral health, reduce blood pressure, help with weight control, improve antibacterial and antivirasic activity, provide protection from solar ultraviolet light,[9] and increase bone mineral density. Green tea is also said to have "anti-fibrotic properties, and neuroprotective power."[10] Additional research is needed to "fully understand its contributions to human health, and advise its regular consumption in Western diets."[10]

Tea catechins have known anti-inflammatory and neuroprotective properties, help regulate food intake, and have an affinity for cannabinoid receptors, which may suppress pain and nausea and provide calming effects.[11]

Consumption of green tea is associated with a lower risk of diseases that cause functional disability, such as “stroke, cognitive impairment, and osteoporosis” in the elderly.[12][13]

Tea contains L-theanine, an amino acid whose consumption is strongly associated with a calm but alert and focused, relatively productive (alpha wave-dominant) mental state in humans. This mental state is also common to meditative practice.[14]

The phrase "herbal tea" usually refers to infusions of fruit or herbs made without the tea plant, such as rosehip tea, chamomile tea, or rooibos tea. Alternative phrases for this are tisane or herbal infusion, both bearing an implied contrast with "tea" as it is construed here.

Cultivation and harvesting

A tea plantation in the Cameron Highlands in Malaysia

Camellia sinensis is an evergreen plant that grows mainly in tropical and subtropical climates.[15] Some varieties can also tolerate marine climates and are cultivated as far north as Pembrokeshire in the British mainland[16] and Washington in the United States.[17]

Leaves of Camellia sinensis, the tea plant

Tea plants are propagated from seed and cutting; it takes about 4 to 12 years for a tea plant to bear seed, and about three years before a new plant is ready for harvesting.[15] In addition to a zone 8 climate or warmer, tea plants require at least 127 cm (50 inches) of rainfall a year and prefer acidic soils.[18] Many high-quality tea plants are cultivated at elevations of up to 1,500 m (4,900 ft) above sea level. While at these heights the plants grow more slowly, they acquire a better flavour.[19]

Two principal varieties are used: Camellia sinensis var. sinensis, which is used for most Chinese, Formosan and Japanese teas, and Camellia sinensis var. assamica, used in Pu-erh and most Indian teas (but not Darjeeling). Within these botanical varieties, there are many strains and modern clonal varieties. Leaf size is the chief criterion for the classification of tea plants, with three primary classifications being,[20] Assam type, characterised by the largest leaves; China type, characterised by the smallest leaves; Cambodian type, characterised by leaves of intermediate size.

A tea plant will grow into a tree of up to 16 m (52 ft) if left undisturbed,[15] but cultivated plants are generally pruned to waist height for ease of plucking. Also, the short plants bear more new shoots which provide new and tender leaves and increase the quality of the tea.[21]

Only the top 1–2 inches of the mature plant are picked. These buds and leaves are called flushes.[22] A plant will grow a new flush every seven to fifteen days during the growing season. Leaves that are slow in development tend to produce better-flavoured teas.[15] Pests of tea include mosquito bugs that can tatter leaves, so they may be sprayed with insecticides.

Processing and classification

Main article: Tea processing
Tea leaf processing methods
Fresh tea leaves of different sizes: The smaller the leaf, the more expensive the tea.

Teas can generally be divided into categories based on how they are processed. There are at least six different types of tea: white, yellow, green, oolong (or wulong), black (called red tea in China), and post-fermented tea (or black tea for the Chinese)[23] of which the most commonly found on the market are white, green, oolong, and black. Some varieties, such as traditional oolong tea[24] and Pu-erh tea, a post-fermented tea, can be used medicinally.[25]

After picking, the leaves of C. sinensis soon begin to wilt and oxidize, unless they are immediately dried. The leaves turn progressively darker as their chlorophyll breaks down and tannins are released. This enzymatic oxidation process is caused by the plant's intracellular enzymes and causes the tea to darken. In tea processing, the darkening is stopped at a predetermined stage by heating, which deactivates the enzymes responsible. In the production of black teas, the halting of oxidation by heating is carried out simultaneously with drying.

Tea harvest on the eastern shores of the Black Sea, circa 1905–15

Without careful moisture and temperature control during manufacture and packaging, the tea may become unfit for consumption, due to the growth of undesired molds and bacteria.

Blending and additives

Main article: Tea blending and additives

Although single-estate teas are available, almost all teas in bags and most other teas sold in the West are now blends. Tea may be blended with other teas from the same area of cultivation or with teas from several different areas. The aim of blending is to obtain a better taste, a higher price, or both, as a more expensive, better-tasting tea is sometimes used to cover the inferior taste of cheaper varieties.

Some commercial teas have been enhanced through additives or special processing. Tea easily retains odors, which can cause problems in processing, transportation, and storage but also allows for the design of an almost endless range of scented and flavoured variants, such as bergamot (Earl Grey), vanilla, and caramel.

Content

Tea contains catechins, a type of antioxidant. In a freshly picked tea leaf, catechins can comprise up to 30% of the dry weight.[citation needed] Catechins are highest in concentration in white and green teas, while black tea has substantially fewer due to its oxidative preparation.[26][27] Research by the U.S. Department of Agriculture has suggested that the levels of antioxidants in green and black teas do not differ greatly, as green tea has an oxygen radical absorbance capacity (ORAC) of 1253 and black tea an ORAC of 1128 (measured in μmol TE/100 g).[28] Antioxidant content, measured by the lag time for oxidation of cholesterol, is improved by cold-water steeping of varieties of tea.[11]

Tea also contains the amino acid L-theanine which modulates caffeine's psychoactive effect and contributes to tea's umami taste. Caffeine constitutes about 3% of tea's dry weight, translating to between 30 mg and 90 mg per 8-oz (250-ml) cup depending on type, brand,[29] and brewing method.[30]

Tea also contains small amounts of theobromine and theophylline, which are stimulants and xanthines similar to caffeine.[31]

Because of modern environmental pollution, fluoride and aluminium also sometimes occur in tea, certain types of brick tea made from old leaves and stems having the highest levels.[32][33]

Although tea contains various polyphenols and tannins, it does not contain tannic acid.[34]

Origin and history

Main article: History of tea
A 19th-century Japanese painting depicting Shennong. Chinese legends credit Shennong with the invention of tea.[35]

Tea plants are native to East and South Asia, and probably originated around the meeting points of the lands of northeast India, north Burma and southwest China. Statistical cluster analysis, chromosome number, easy hybridization, and various types of intermediate hybrids and spontaneous polyploids indicate that there is likely a single place of origin for Camellia sinensis, an area including the northern part of Burma, and Yunnan and Sichuan provinces of China.[36] Tea drinking likely began during the Shang Dynasty, when it was used for medicinal purposes.[6] It is believed that, soon after, "for the first time, people began to boil tea leaves for consumption into a concentrated liquid without the addition of other leaves or herbs, thereby using tea as a bitter yet stimulating drink, rather than as a medicinal concoction."[6]

Tea weighing station north of Batumi, Russian Empire before 1915

Although there are tales of tea's first use as a beverage, no one is sure of its exact origins. A Chinese inventor was the first person to invent a tea shredder.[37] The first recorded drinking of tea is in China, with the earliest records of tea consumption dating to the 10th century BC.[2][38] Another early credible record of tea drinking dates to the 3rd century AD, in a medical text by Hua T'o, who stated that "to drink bitter t'u constantly makes one think better." Another early reference to tea is found in a letter written by the Qin Dynasty general Liu Kun.[39] A Chinese legend attributes the invention of tea to Shennong in 2737 BC.[35] It was already a common drink during the Qin Dynasty (third century BC) and became widely popular during the Tang Dynasty, when it was spread to Korea, Japan and Vietnam. In India it has been drunk for medicinal purposes for a long but uncertain period, but apart from the Himalayan region seems not to have been used as a beverage until the British introduced Chinese tea there.

Tea was first introduced to Portuguese priests and merchants in China during the 16th century, at which time it was termed chá.[7] In 1750, tea experts travelled from China to the Azores, and planted tea, along with jasmine and mallow, to give it aroma and distinction. Both green and black tea continue to grow on the islands, which are the main suppliers to continental Portugal. Catherine of Braganza, wife of King Charles II of England, took the tea habit to Great Britain around 1660, but tea was not widely consumed in Britain until the 18th century, and remained expensive until the latter part of that period. In Britain and Ireland, tea had become an everyday beverage for all levels of society by the late 19th century, but at first it was consumed as a luxury item on special occasions, such as religious festivals, wakes, and domestic work gatherings such as quiltings.[40] The price in Europe fell steadily during the 19th century, especially after Indian tea began to arrive in large quantities.

The first European to successfully transplant tea to the Himalayas, Robert Fortune, was sent by the East India Company on a mission to China in 1848 to bring the tea plant back to Great Britain. He began his journey in high secrecy as his mission occurred in the lull between the two Anglo-Chinese Wars or opium wars, and westerners were not in high regard at the time.[41]

Tea was first introduced into India by the British, in an attempt to break the Chinese monopoly on tea. The British brought Chinese seeds into Northeast India but the plants failed; they later discovered that a different variety of tea was endemic to Assam and the Northeast region of India and that it was used by local tribes. Using the Chinese planting and cultivation techniques, the British launched a tea industry by offering land in Assam to any European who agreed to cultivate tea for export.[8] Tea was originally consumed only by anglicized Indians; it was not until the 1950s that tea grew widely popular in India through a successful advertising campaign by the India Tea Board.[8]

Health effects

Main article: Health effects of tea
A cup of tea

Tea contains a large number of possibly bioactive chemicals, including flavinoids, amino acids, vitamins, caffeine and several polysaccharides, and a variety of health effects have been proposed and investigated.[20] It has been suggested that green and black tea may protect against cancer,[42] though the catechins found in green tea are thought to be more effective in preventing certain obesity-related cancers such as liver and colorectal cancer,[43] while both green and black teas may protect against cardiovascular disease.[42]

Numerous recent epidemiological studies have been conducted to investigate the effects of green tea consumption on the incidence of human cancers. These studies suggest significant protective effects of green tea against oral, pharyngeal, oesophageal, prostate, digestive, urinary tract, pancreatic, bladder, skin, lung, colon, breast, and liver cancers, and lower risk for cancer metastasis and recurrence.[42] A study led by Dr Kashif Shafique of Glasgow University found a 50% greater risk of prostate cancer amongst men who drank more than seven cups of tea per day, compared to those with moderate or lower tea intake.[44]

Preliminary lab studies show that "a wide variety of commercial teas appear to either inactivate or kill viruses," reports Reuters Health Information. Several types of green and black teas, regular and iced, were tested on animal tissues infected with such viruses as herpes simplex 1 and 2 and the T1 (bacterial) virus. According to researcher Dr. Milton Schiffenbauer of Pace University in New York, "iced tea or regular tea does destroy or inactivate the [herpes] virus within a few minutes." Similar results were obtained with the T1 virus.[45]

The word "tea"

"Tea, Australia's national drink." Parade in Sydney, 1938.

The Chinese character for tea is 茶. It is pronounced differently in the various Chinese languages. Most pronounce it along the lines of cha (Mandarin has chá), but the Min varieties along the central coast of China and in Southeast Asia pronounce it like te. These two pronunciations have made their separate ways into other languages around the world:[46]

  • Te is from the Amoy tê of Fujian Province and Taiwan. It reached the West from the port of Xiamen (Amoy), once a major point of contact with Western European traders such as the Dutch, who spread it to Western Europe.
  • Cha is from the Cantonese chàh of Guangzhou (Canton) and the ports of Hong Kong and Macau, also major points of contact, especially with the Portuguese, who spread it to India in the 16th century. The Korean and Japanese words cha come not from Cantonese but from the Mandarin chá.

The widespread form chai comes from Persian چای chay. This derives from Mandarin chá,[47] which passed overland to Central Asia and Persia, where it picked up the Persian grammatical suffix -yi before passing on to Russian, Arabic, Urdu, Turkish, etc.[48]

English has all three forms: cha or char (both pronounced /ˈtʃɑː/), attested from the 16th century; tea, from the 17th; and chai, from the 20th.

Languages in more intense contact with Chinese, Sinospheric languages like Vietnamese, Zhuang, Tibetan, Korean, and Japanese, may have borrowed their words for tea at an earlier time and from a different variety of Chinese, so-called Sino-Xenic pronunciations. Korean and Japanese, for example, retain early pronunciations of ta and da. Ta comes from the Tang Dynasty court at Chang'an: that is, from Middle Chinese. Japanese da comes from the earlier Southern Dynasties court at Nanjing, a place where the consonant was still voiced, as it is today in neighbouring Shanghainese zo. Vietnamese and Zhuang have southern cha-type pronunciations.

Derivatives of te

Language Name Language Name Language Name Language Name Language Name
Afrikaans tee Armenian թեյ tey Basque tea Catalan te Czech té or thé (1)
Danish te Dutch thee English tea Esperanto teo Estonian tee
Faroese te Finnish tee French thé West Frisian tee Galician té
German Tee Greek τέϊον téïon Hebrew תה, te Hungarian tea Icelandic te
Indonesian teh Irish tae Italian tè, thè or the Javanese tèh Khmer តែ tae
scientific Latin thea Latvian tēja Leonese té Limburgish tiè Lithuanian arbata(2)
Low Saxon Tee [tʰɛˑɪ] or Tei [tʰaˑɪ] Malay teh Malayalam തേയില Thēyila Maltese tè Mongolian цай tsai
Norwegian te Occitan tè Polish herbata(2) Kannada ಟೀಸೊಪ್ಪು Tee-soppu Scottish Gaelic tì, teatha
Sinhalese té තේ Spanish té Scots tea [tiː] ~ [teː] Tamil தேநீர் theneer (3)
Telugu తేనీరు theneeru (4) Welsh te Sundanese entèh Swedish te

Notes:

  • (1) té or thé, but this term is considered archaic and is a literary expression; since roughly the beginning of the 20th century, čaj is used for "tea" in Czech language, see the following table
  • (2) from Latin herba thea
  • (3) neer means water; theyilai means "tea leaf" (ilai = leaf)
  • (4) neeru means water; theyaaku means "tea leaf" (aaku = leaf in Telugu)

Derivatives of ta

Language Name Language Name
Japanese だ da, た ta (1) Korean 다 da [ta] (1)
  • (1) cha is an alternative pronunciation of "tea" in Japanese and Korean; see below

Derivatives of cha

Language Name Language Name Language Name Language Name Language Name
Assamese চাহ sah Bangla চা cha Kapampangan cha Cebuano tsa English cha or char
Greek τσάι chai Gujarati ચા chā Japanese 茶, ちゃ Cha, (1) Kannada ಚಹಾ chahā Khasi sha
Konkani च्या chyā Korean 차 cha (1) Kurdish ça Lao ຊາ saa Malayalam chāyā
Marathi चहा chahā Oriya ଚା cha Persian چای chā Punjabi چا ਚਾਹ chāh Portuguese chá
Sindhi chahen چانهه Somali shaah Sylheti sa Tagalog tsaá Thai ชา cha
Tibetan ཇ་ ja Turkish çay Vietnamese trà and chè (2)

Notes:

  • (1) The main pronunciations of 茶 in Korea and Japan are 차 cha and ちゃ cha, respectively. (Japanese ocha (おちゃ) is honorific.) These are connected with the pronunciations at the capitals of the Song and Ming dynasties.
  • (2) Trà and chè are variant pronunciations of 茶; the latter is used mainly in northern Vietnam and describes a tea made with freshly picked leaves.

Derivatives of chay

Language Name Language Name Language Name Language Name Language Name
Chechen чай chay Albanian (Tosk) çaj Amharic ሻይ shai Arabic شاي shāy Aramaic ܟ݈ܐܝ chai
Armenian (Eastern) թեյ tey Azerbaijani çay Bosnian čaj Bulgarian чай chai Croatian čaj
Czech čaj (2) English chai Finnish dialectal tsai, tsaiju, saiju or saikka Georgian ჩაი chai Greek τσάι tsái
Hindi चाय chāy Kazakh шай shai Kyrgyz чай chai Kinyarwanda icyayi Ladino צ'יי chai
Macedonian чај čaj Malayalam ചായ chaaya Mongolian цай tsai Nepali chiyā चिया Pashto چای chay
Persian چای chāī (1) Romanian ceai Russian чай chay Serbian чај čaj Slovak čaj
Slovene čaj Swahili chai Tajik чой choy Tatar çäy Tlingit cháayu
Turkish çay Turkmen çay Ukrainian чай chai Urdu چائے chai Uzbek choy

Notes:

  • (1) Derived from the earlier pronunciation چا cha.

Etymological observations

The different words for tea fall into two main groups: "te-derived" (Min) and "cha-derived" (Cantonese and Mandarin).[48] The words that various languages use for "tea" reveal where those nations first acquired their tea and tea culture.

  • Portuguese traders were the first Europeans to import the herb in large amounts. The Portuguese borrowed their word for tea (chá) from Cantonese in the 1550s via their trading posts in the south of China, especially Macau.[49]
  • In Central Asia, Mandarin cha developed into Persian chay, and this form spread with Persian trade and cultural influence.
  • Russia (chai) encountered tea in Central Asia.
  • The Burmese word for "tea", lahpet (MLCTS: lak hpak, pronounced: [ləpʰɛʔ]) does not fall into either of the two main groups and may have originated independently.
  • The Dutch word for "tea" (thee) comes from the Min dialect. The Dutch may have borrowed their word for tea through trade directly from Fujian, or from Fujianese or Malay traders in Java. From 1610 on, the Dutch played a dominant role in the early European tea trade, via the Dutch East India Company, influencing other languages to use the Dutch word for tea. Other European languages whose words for tea derive from the Min dialect (via Dutch) include English, French (thé), Spanish (té), and German (Tee).[49]
  • The Dutch first introduced tea to England in 1644.[49] By the 19th century, most British tea was purchased directly from merchants in Canton, whose population uses cha, though English never replaced its Dutch-derived Min word for tea.

At times, a te form will follow a cha form, or vice versa, giving rise to both in one language, at times one an imported variant of the other.

  • In North America, the word chai is used to refer almost exclusively to the Indian masala chai (spiced tea) beverage, in contrast to tea itself.
  • The inverse pattern is seen in Moroccan colloquial Arabic (Darija), shay means "generic, or black Middle Eastern tea" whereas tay refers particularly to Zhejiang or Fujian green tea with fresh mint leaves. The Moroccans are said to have acquired this taste for green tea—unique in the Arab world—after the ruler Mulay Hassan exchanged some European hostages captured by the Barbary pirates for a whole ship of Chinese tea. See Moroccan tea culture.
  • The colloquial Greek word for tea is tsáï, from Slavic chai. Its formal equivalent, used in earlier centuries, is téïon, from tê.
  • The Polish word for a tea-kettle is czajnik, which could be derived directly from chai or from the cognate Russian word. However, tea in Polish is herbata, which, as well as Lithuanian arbata, was derived from the Latin herba thea, meaning "tea herb."
  • The normal word for tea in Finnish is tee, which is a Swedish loan. However, it is often colloquially referred to, especially in Eastern Finland and in Helsinki, as tsai, tsaiju, saiju or saikka, which is cognate to the Russian word chai. The latter word refers always to black tea, while green tea is always tee.
  • In Ireland, or at least in Dublin, the term cha is sometimes used for "tea," as is pre-vowel-shift pronunciation "tay" (from which the Irish Gaelic word tae is derived[citation needed]). Char was a common slang term for tea throughout British Empire and Commonwealth military forces in the 19th and 20th centuries, crossing over into civilian usage.
  • The British slang word "char" for "tea" arose from its Cantonese Chinese pronunciation "cha" with its spelling affected by the fact that ar is a more common way of representing the phoneme /ɑː/ in British English.

Tea culture

Main article: Tea culture
Masala chai from India with garnishes
In India, tea is referred to as chai and is often served in a small glass.
Iced tea with a slice of lemon

Tea may be consumed early in the day to heighten calm alertness; it contains L-theanine,[14] theophylline, and bound caffeine[5] (sometimes called theine). Decaffeinated brands are also sold.

While tea is the second most consumed beverage on Earth after water, in many cultures it is also consumed at elevated social events, such as afternoon tea and the tea party. Tea ceremonies have arisen in different cultures, such as the Chinese and Japanese tea ceremonies, each of which employs traditional techniques and ritualised protocol of brewing and serving tea for enjoyment in a refined setting. One form of Chinese tea ceremony is the Gongfu tea ceremony, which typically uses small Yixing clay teapots and oolong tea.

Ireland has, for a long time, been one of the biggest per-capita consumers of tea in the world. The national average is four cups per person per day, with many people drinking six cups or more. Tea in Ireland is usually taken with milk and/or sugar and is slightly spicier and stronger than the traditional English blend. The two main brands of tea sold in Ireland are Lyons and Barry's. The Irish love of tea is perhaps best illustrated by the stereotypical housekeeper, Mrs. Doyle in the popular sitcom Father Ted.

Tea is prevalent in most cultures in the Middle East. In Arab culture, tea is a focal point for social gatherings.

In Pakistan, tea is called chai (written as چائے). Both black and green teas are popular and are known locally as sabz chai and kahwah, respectively. The popular green tea called kahwah is often served after every meal in the Pashtun belt of Balochistan and in Khyber Pakhtunkhwa, which is where the Khyber Pass of the Silk Road is found.

In the transnational Kashmir region, which straddles the border between India and Pakistan, Kashmiri chai or noon chai, a pink, creamy tea with pistachios, almonds, cardamom, and sometimes cinnamon, is consumed primarily at special occasions, weddings, and during the winter months when it is sold in many kiosks.

In central and southern Punjab and the metropolitan Sindh region of Pakistan, tea with milk and sugar (sometimes with pistachios, cardamom, etc.), commonly referred to as chai, is widely consumed. It is the most common beverage of households in the region. In the northern Pakistani regions of Chitral and Gilgit-Baltistan, a salty, buttered Tibetan-style tea is consumed. In Iranian culture, tea is so widely consumed, it is generally the first thing offered to a household guest.[50]

In the United States and Canada, 80% of tea is consumed cold, as iced tea.[51] Sweet tea is a cultural symbol of the southeastern US, and is common in that portion of the country.

Switzerland has its own unique blend of iced tea, made with the basic ingredients like black tea, sugar, lemon juice and mint, but a variety of Alp herbs are also added to the concoction. Apart from classic flavours like lemon and peach, exotic flavours like jasmine and lemongrass are also very popular.

In India, tea is one of the most popular hot beverages. It is consumed daily in almost all homes, offered to guests, consumed in high amounts in domestic and official surroundings, and is made with the addition of milk with or without spices. It is also served with biscuits dipped in the tea and eaten before consuming the tea. More often than not, it is drunk in "doses" of small cups (referred to as "Cutting" chai if sold at street tea vendors) rather than one large cup. On 21 April 2012, the Deputy Chairman of Planning Commission (India), Montek Singh Ahluwalia, said tea would be declared as national drink by April 2013.[52][53] The move is expected to boost the tea industry in the country. Speaking on the occasion, Assam Chief Minister Tarun Gogoi said a special package for the tea industry would be announced in the future to ensure its development.[54]

In the United Kingdom, it is consumed daily and often by a majority of people across the country, and indeed is perceived as one of Britain's cultural beverages. In British homes, it is customary good manners for a host to offer tea to guests soon after their arrival. Tea is generally consumed at home; outside the home in cafés. Afternoon tea with cakes on fine porcelain is a cultural stereotype, sometimes available in quaint tea-houses. In southwest England, many cafes serve a 'cream tea', consisting of scones, clotted cream, and jam alongside a pot of tea. Throughout the UK, 'tea' may also refer to the evening meal.

In Burma (Myanmar), tea is consumed not only as hot drinks, but also as sweet tea and green tea known locally as laphet-yay and laphet-yay-gyan, respectively. Pickled tea leaves, known locally as laphet, are also a national delicacy. Pickled tea is usually eaten with roasted sesame seeds, crispy fried beans, roasted peanuts and fried garlic chips.

Preparation

Teakettle boiling water over hot coals at a tea house in Jiufen, Taiwan
Tea of different fermentation prepared, in cups (LtoR): green tea, yellow tea, oolong, and black

The traditional method of making or brewing a cup of tea is to place loose tea leaves, either directly or in a tea infuser, into a tea pot or teacup and pour freshly boiled water over the leaves. After a few minutes, the leaves are usually removed, either by removing the infuser or by straining the tea while serving.

Most green teas should be allowed to steep for about two or three minutes, although some types of tea require as much as ten minutes, and others as little as 30 seconds. The strength of the tea should be varied by changing the amount of tea leaves used, not by changing the steeping time. The amount of tea to be used per amount of water differs from tea to tea, but one basic recipe may be one slightly heaped teaspoon of tea (about 5 ml) for each teacup of water (200–240 ml) (7–8 oz) prepared as above. Stronger teas, such as Assam, to be drunk with milk, are often prepared with more leaves, and more delicate high-grown teas such as a Darjeeling are prepared with somewhat fewer (as the stronger mid-flavours can overwhelm the champagne notes).

The best temperature for brewing tea depends on its type. Teas that have little or no oxidation period, such as a green or white tea, are best brewed at lower temperatures, between 65 and 85 °C (149 and 185 °F), while teas with longer oxidation periods should be brewed at higher temperatures around 100 °C (212 °F). The higher temperatures are required to extract the large, complex, flavourful phenolic molecules found in fermented tea. In addition, boiling reduces the dissolved oxygen content of water. Dissolved oxygen would otherwise react with phenolic molecules to turn them brown and reduce their potency as antioxidants. To preserve the antioxidant potency, especially for green and white teas brewed at a lower temperature, water should be boiled vigorously to boil off any dissolved oxygen and then allowed to cool to the appropriate temperature before adding to the tea. An additional health benefit of boiling water before brewing tea is the sterilisation of the water and reduction of any dissolved VOCs, chemicals which are often harmful.[55][56]

Type Water temp. Steep time Infusions
White tea 65 to 70 °C (149 to 158 °F) 1–2 minutes 3
Yellow tea 70 to 75 °C (158 to 167 °F) 1–2 minutes 3
Green tea 75 to 80 °C (167 to 176 °F) 1–2 minutes 4–6
Oolong tea 80 to 85 °C (176 to 185 °F) 2–3 minutes 4–6
Black tea 99 °C (210 °F) 2–3 minutes 2–3
Pu'er tea 95 to 100 °C (203 to 212 °F) Limitless Several
Tisanes 99 °C (210 °F) 3–6 minutes Varied

Some tea sorts are often brewed several times using the same leaves. Historically in China, tea is divided into a number of infusions. The first infusion is immediately poured out to wash the tea, and then the second and further infusions are drunk. The third through fifth are nearly always considered the best infusions of tea, although different teas open up differently and may require more infusions of hot water to produce the best flavour.[57]

To keep the temperature of the tea in a teapot a tea cosy is often used.

One way to taste a tea, throughout its entire process, is to add hot water to a cup containing the leaves and after about 30 seconds to taste it. As the tea leaves unfold (known as "The Agony of the Leaves"), they expose various parts of themselves to the water and thus the taste evolves. Continuing this from the very first flavours to the time beyond which the tea is quite stewed will allow an appreciation of the tea throughout its entire length.[58]

Antioxidant content, measured by the lag time for oxidation of cholesterol, is improved by the cold-water steeping of varieties of tea.[11]

Black tea infusion
In Turkey, the per-capita consumption of Turkish tea exceeds 10 cups per day and 13.8 kg per year.[59]

Black tea

In the West, water for black tea is usually added near the boiling point of water, at around 99 °C (210 °F). Many of the active substances in black tea do not develop at temperatures lower than 90 °C (194 °F).[citation needed] Lower temperatures are used for some more delicate teas. The temperature will have as large an effect on the final flavour as the type of tea used. The most common fault when making black tea is to use water at too low a temperature. Since boiling point drops with increasing altitude, it is difficult to brew black tea properly in mountainous areas. It is also recommended by the British that the teapot be warmed before preparing tea, easily done by adding a small amount of boiling water to the pot, swirling briefly, then discarding it.

Western black teas are usually brewed for about four minutes and are usually not allowed to steep for less than 30 seconds or more than about five minutes (a process known as brewing or mashing in Britain). In many regions of the world, however, boiling water is used and the tea is often stewed. For example in India, black tea is often boiled for fifteen minutes or longer as a strong brew is preferred for making Masala chai. When the tea has brewed long enough to suit the tastes of the drinker, it should be strained while serving. Popular varieties of black tea include Assam, Nepal, Darjeeling, Nilgiri, Turkish and Ceylon teas.

Green tea

Water for green tea, according to regions of the world that prefer mild tea, should be around 80 to 85 °C (176 to 185 °F); the higher the quality of the leaves, the lower the temperature. Hotter water will produce a bitter taste. However, this is the method used in many regions of the world, such as North Africa or Central Asia, where bitter tea is appreciated. For example, in Morocco, green tea is steeped in boiling water for 15 minutes. In the West and Far East, a milder tea is appreciated. The container in which the tea is steeped, the mug or teapot, is often warmed beforehand so the tea does not immediately cool down. High-quality green and white teas can have new water added as many as five or more times, depending on variety, at increasingly higher temperatures.

Oolong tea

Oolong teas should be brewed around 80 to 100 °C (176 to 212 °F), and the brewing vessel should be warmed before pouring in the water. Yixing purple clay teapots are the traditional brewing-vessel for oolong tea. For best results, spring water should be used as the minerals in spring water tend to bring out more flavour in the tea. High quality oolong can be brewed multiple times from the same leaves, and unlike green tea, it improves with reuse. It is common to brew the same leaves three to five times, the third steeping usually considered the best. In the Chinese and Taiwanese Gongfu tea ceremony, the first brew is not drunk at all but disposed of as it is considered a wash of the leaves rather than a proper brew.

Premium or delicate tea

A strainer is often used when tea is made with tea-leaves in a teapot.

Some teas, especially green teas and delicate oolong teas, are steeped for shorter periods, sometimes less than 30 seconds. Using a tea strainer separates the leaves from the water at the end of the brewing time if a tea bag is not being used. However, the black Darjeeling tea, a premium Indian tea, needs a longer than average steeping time. Elevation and time of harvest offer varying taste profiles; proper storage and water quality also have a large impact on taste.

Pu-erh tea

Pu-erh teas require boiling water for infusion. Some prefer to quickly rinse pu-erh for several seconds with boiling water to remove tea dust which accumulates from the ageing process, then infuse it at the boiling point (100°C or 212°F), and allow it to steep from 30 seconds to five minutes.

Serving

To preserve the pretannin tea without requiring it all to be poured into cups, a second teapot may be used. The steeping pot is best unglazed earthenware; Yixing pots are the best known of these, famed for the high quality clay from which they are made. The serving pot is generally porcelain, which retains the heat better. Larger teapots are a post-19th century invention, as tea before this time was very rare and very expensive. Experienced tea-drinkers often insist the tea should not be stirred around while it is steeping (sometimes called winding or mashing in the UK). This, they say, will do little to strengthen the tea, but is likely to bring the tannins out in the same way that brewing too long will do. For the same reason, one should not squeeze the last drops out of a teabag; if stronger tea is desired, more tea leaves should be used.

Additives

Further information: Tea blending and additives
Tea is sometimes taken with milk

The addition of milk to tea in Europe was first mentioned in 1680 by the epistolist Madame de Sévigné.[60] Many teas are traditionally drunk with milk in cultures where dairy products are consumed. These include Indian masala chai and British tea blends. These teas tend to be very hearty varieties of black tea which can be tasted through the milk, such as Assams, or the East Friesian blend. Milk is thought to neutralise remaining tannins and reduce acidity.[61][62] The Han Chinese do not usually drink milk with tea but the Manchus do, and the elite of the Qing Dynasty of the Chinese Empire continued to do so. Hong Kong-style milk tea is based on British colonial habits. Tibetans and other Himalayan peoples traditionally drink tea with milk or yak butter and salt. In Eastern European countries (Russia, Poland and Hungary) and in Italy, tea is commonly served with lemon juice. In Poland, tea with milk is called a bawarka ("Bavarian style"), and is often drunk by pregnant and nursing women.

The order of steps in preparing a cup of tea is a much-debated topic, and can vary widely between cultures or even individuals. Some say it is preferable to add the milk before the tea, as the high temperature of freshly brewed tea can denature the proteins found in fresh milk, similar to the change in taste of UHT milk, resulting in an inferior-tasting beverage.[63] Others insist it is better to add the milk after brewing the tea, as most teas need to be brewed as close to boiling as possible. The addition of milk chills the beverage during the crucial brewing phase, if brewing in a cup rather than using a pot, meaning the delicate flavour of a good tea cannot be fully appreciated. By adding the milk afterwards, it is easier to dissolve sugar in the tea and also to ensure the desired amount of milk is added, as the colour of the tea can be observed.[citation needed] Historically, the order of steps was taken as an indication of class: only those wealthy enough to afford good-quality porcelain would be confident of its being able to cope with being exposed to boiling water unadulterated with milk.[64]

File:Minttea.JPG
Moroccan tea being served: It is poured from a distance to produce a foam on the tea.

A 2007 study published in the European Heart Journal found certain beneficial effects of tea may be lost through the addition of milk.[65]

Many flavourings are added to varieties of tea during processing. Among the best known are Chinese jasmine tea, with jasmine oil or flowers, the spices in Indian masala chai, and Earl Grey tea, which contains oil of bergamot. A great range of modern flavours have been added to these traditional ones. In eastern India, people also drink lemon tea or lemon masala tea. Lemon tea simply contains hot tea with lemon juice and sugar. Masala lemon tea contains hot tea with roasted cumin seed powder, lemon juice, black salt and sugar, which gives it a tangy, spicy taste. Adding a piece of ginger when brewing tea is a popular habit of Sri Lankans, who also use other types of spices such as cinnamon to sweeten the aroma.

Other popular additives to tea by the tea-brewer or drinker include sugar, liquid honey or a solid Honey Drop, agave nectar, fruit jams, and mint. In China, sweetening tea was traditionally regarded as a feminine practice. In colder regions, such as Mongolia, Tibet and Nepal, butter is added to provide necessary calories. Tibetan butter tea contains rock salt and dre, a butter made from yak milk, which is churned vigorously in a cylindrical vessel closely resembling a butter churn. The same may be said for salt tea, which is popular in the Hindu Kush region of northern Pakistan.

Alcohol, such as whisky or brandy, may also be added to tea.

The flavour of the tea can also be altered by pouring it from different heights, resulting in varying degrees of aeration. The art of high-altitude pouring is used principally by people in Northern Africa (e.g. Morocco, Algeria, Mauritania, Libya and Western Sahara), but also in West Africa (e.g. Guinea, Mali, Senegal) and can positively alter the flavour of the tea, but it is more likely a technique to cool the beverage destined to be consumed immediately. In certain cultures, the tea is given different names depending on the height from which it is poured. In Mali, gunpowder tea is served in series of three, starting with the highest oxidisation or strongest, unsweetened tea (cooked from fresh leaves), locally referred to as "strong like death", followed by a second serving, where the same tea leaves are boiled again with some sugar added ("pleasant as life"), and a third one, where the same tea leaves are boiled for the third time with yet more sugar added ("sweet as love"). Green tea is the central ingredient of a distinctly Malian custom, the "Grin", an informal social gathering that cuts across social and economic lines, starting in front of family compound gates in the afternoons and extending late into the night, and is widely popular in Bamako and other large urban areas.

In Southeast Asia, particularly in Singapore and Malaysia, the practice of pouring tea from a height has been refined further using black tea to which condensed milk is added, poured from a height from one cup to another several times in alternating fashion and in quick succession, to create a tea with entrapped air bubbles creating a frothy "head" in the cup. This beverage, teh tarik, literally, "pulled tea" (which has its origin as a hot Indian tea beverage), has a creamier taste than flat milk tea and is extremely popular in the region. Tea pouring in Malaysia has been further developed into an art form in which a dance is done by people pouring tea from one container to another, which in any case takes skill and precision. The participants, each holding two containers, one full of tea, pour it from one to another. They stand in lines and squares and pour the tea into each other's pots. The dance must be choreographed to allow anyone who has both pots full to empty them and refill those of whoever has no tea at any one point.

Economics

Tea factory in Taiwan
See also: List of countries by tea consumption per capita

Tea is the most popular manufactured drink in the world in terms of consumption. Its consumption equals all other manufactured drinks in the world – including coffee, chocolate, soft drinks, and alcohol – put together.[4] Most tea consumed outside East Asia is produced on large plantations in the hilly regions of India and Sri Lanka, and is destined to be sold to large businesses. Opposite this large-scale industrial production are many small "gardens," sometimes minuscule plantations, that produce highly sought-after teas prized by gourmets. These teas are both rare and expensive, and can be compared to some of the most expensive wines in this respect.

India is the world's largest tea-drinking nation,[66] although the per capita consumption of tea remains a modest 750 grams per person every year. Turkey, with 2.5 kg of tea consumed per person per year, is the world's greatest per capita consumer.[67]

Production

In 2003, world tea production was 3.21 million tonnes annually.[68] In 2010, world tea production reached over 4.52 million tonnes.[68] The largest producers of tea are the People's Republic of China, India, Kenya, Sri Lanka, and Turkey.

Percentage of total tea production in 2008
   Less than 0.5% or insignificant quantities
   From 0.5 to 1%.
   From 1 to 5%.
   From 5 to 10%.
   From 10 to 20%.
   More than 20%
Percentage of total global tea production by country in 2007

The following table shows the amount of tea production (in tonnes) by leading countries in recent years. Data are generated by the Food and Agriculture Organization of the United Nations as of February 2012.[68]

Rank Country[68] 2008 2009 2010 2011
1  China 1,274,984 1,375,780 1,467,467 1,640,310
2  India 987,000 972,700 991,180 1,063,500
3  Kenya 345,800 314,100 399,000 377,912
4  Sri Lanka 318,700 290,000 282,300 327,500
5  Turkey 198,046 198,601 235,000 221,600
6  Vietnam 173,500 185,700 198,466 206,600
7  Iran 165,717 165,717 165,717 162,517
8  Indonesia 150,851 146,440 150,000 142,400
9  Argentina 80,142 71,715 88,574 96,572
10  Japan 96,500 86,000 85,000 82,100
Total World 4,211,397 4,242,280 4,518,060 4,321,011

Certification

Workers who pick and pack tea on plantations in developing countries can face harsh working conditions and can earn below the living wage.[69]

A number of bodies independently certify the production of tea. Tea from certified estates can be sold with a certification label on the pack. The most important[according to whom?] certification schemes are Rainforest Alliance, Fairtrade, UTZ Certified, and Organic. All these schemes certify other crops (such as coffee, cocoa and fruit), as well. Rainforest Alliance certified tea is sold by Unilever brands Lipton and PG Tips in Western Europe, Australia and the US. Fairtrade certified tea is sold by a large number of suppliers around the world. UTZ Certified announced a partnership in 2008 with Sara Lee brand Pickwick tea.

Production of organic tea is rising; 6,000 tons of organic tea were sold in 1999.[70] The majority of this tea (about 75%) is sold in France, Germany, Japan, the United Kingdom and the United States.[citation needed]

Trade

According to the FAO in 2007, the largest importer of tea, by weight, was the Russian Federation, followed by the United Kingdom, Pakistan, and the United States.[71] Kenya, China, India and Sri Lanka were the largest exporters of tea in 2007 (with exports of: 374229, 292199, 193459 and 190203 tonnes respectively).[71][72] The largest exporter of black tea in the world is Kenya, while the largest producer (and consumer) of black tea in the world is India.[72][73]

Packaging

Tea bags

Tea bags
Main article: Tea bag

In 1907, American tea merchant Thomas Sullivan began distributing samples of his tea in small bags of Chinese silk with a drawstring. Consumers noticed they could simply leave the tea in the bag and reuse it with fresh tea. However, the potential of this distribution/packaging method would not be fully realised until later on. During World War II, tea was rationed in the United Kingdom. In 1953 (after rationing in the UK ended), Tetley launched the tea bag to the UK and it was an immediate success.

Tea leaves are packed into a small envelope (usually composed of paper) known as a tea bag. The use of tea bags is easy and convenient, making them popular for many people today. However, the use of tea bags has negative aspects, as well. The tea used in tea bags is commonly fannings or "dust", the waste product produced from the sorting of higher quality loose leaf tea. However, this is not true for all brands of tea; many high quality speciality teas are available in bag form.[citation needed] Tea aficionados commonly believe this method provides an inferior taste and experience. The paper used for the bag may also be tasted, which can detract from the tea's own flavour.[citation needed] Because fannings and dust are a lower quality of the tea to begin with, the tea found in tea bags is less finicky when it comes to brewing time and temperature.

Additional reasons why bag tea is considered less well-flavoured include:

  • Dried tea loses its flavour quickly on exposure to air. Most bag teas (although not all) contain leaves broken into small pieces; the great surface area to volume ratio of the leaves in tea bags exposes them to more air, and therefore causes them to go stale faster. Loose tea leaves are likely to be in larger pieces, or to be entirely intact.[citation needed]
  • Breaking up the leaves for bags extracts flavoured oils.[citation needed]
  • The small size of the bag does not allow leaves to diffuse and steep properly.[citation needed]

The "pyramid tea bag" (or sachet) introduced by Lipton[74] and PG Tips/Scottish Blend in 1996,[75] attempts to address one of the connoisseurs' arguments against paper tea bags by way of its three-dimensional tetrahedron shape, which allows more room for tea leaves to expand while steeping.[citation needed] However, some types of pyramid tea bags have been criticised as being environmentally unfriendly, since their synthetic material is not as biodegradable as loose tea leaves and paper tea bags.[76]

Loose tea

A blend of loose-leaf black teas

The tea leaves are packaged loosely in a canister, paper bag or other container such as a tea chest. Some whole teas, such as rolled gunpowder tea leaves, which resist crumbling, may sometimes be vacuum packed for freshness in aluminised packaging for storage and retail. The portions of loose tea must be individually measured by the consumer for use in a cup, mug, or teapot for example with a measuring spoon. This allows greater flexibility and flavor control, letting the consumer brew weaker or stronger tea as desired, but some convenience is sacrificed. Strainers, "tea presses", filtered teapots, and infusion bags are available commercially to avoid having to drink the floating loose leaves and to prevent over-brewing. A more traditional, yet perhaps more efficient way around this problem is to use a three-piece lidded teacup, called a gaiwan. The lid of the gaiwan can be tilted to decant the leaves while pouring the tea into a different cup for consumption.

Compressed tea

Some teas (particularly Pu-erh tea) are still compressed for transport, storage, and ageing convenience. The tea brick remains in use in the Himalayan countries or Mongolian steppes. The tea is prepared and steeped by first loosening leaves off the compressed cake using a small knife. Compressed teas can usually be stored for longer periods of time without spoilage when compared with loose leaf tea.

Instant tea

In recent times, "instant teas" are becoming popular, similar to freeze-dried instant coffee. Similar products also exist for instant iced tea, due to the convenience of not requiring boiling water. Instant tea was developed in the 1930s, but not commercialised until later. Nestlé introduced the first instant tea in 1946, while Redi-Tea introduced the first instant iced tea in 1953.

These products often come with added flavours, such as chai, vanilla, honey or fruit, and may also contain powdered milk. Tea connoisseurs tend to criticise these products for sacrificing the delicacies of tea flavour in exchange for convenience.

British and Canadian soldiers during the Second World War were issued with an instant tea, known as 'Compo' tea. The blocks of instant tea (which included powdered milk and sugar) were issued in a Composite Ration Pack, hence the name 'Compo'. As Royal Canadian Artillery Gunner, George C Blackburn noted, it was not always well received:

But, unquestionably, the feature of Compo rations destined to be remembered beyond all others is Compo tea...Directions say to "sprinkle powder on heated water and bring to the boil, stirring well, three heaped teaspoons to one pint of water."

Every possible variation in the preparation of this tea was tried, but...it always ended up the same way. While still too hot to drink, it is a good-looking cup of strong tea. Even when it becomes just cool enough to be sipped gingerly, it is still a good-tasting cup of tea, if you like your tea strong and sweet. But let it cool enough to be quaffed and enjoyed, and your lips will be coated with a sticky scum that forms across the surface, which if left undisturbed will become a leathery membrane that can be wound around your finger and flipped away...[77]

Bottled and canned tea

Main article: Canned tea

Switzerland is considered as the motherland of bottled iced tea. Maks Sprengler, a Swiss businessman, tried the famous American iced tea and was the first to suggest producing ready-made iced tea in bottles. In 1983, Bischofszell Food Ltd. became the first producer in the world of bottled ice tea on an industrial scale.[78]

Canned tea is a form of tea that has already been prepared, and is sold ready to drink. Canned tea is a fairly recent innovation, first launched in 1981 in Japan.

Storage

Tea shelf life varies with storage conditions and type of tea. Black tea has a longer shelf life than green tea. An exception, pu-erh tea, improves with age. Tea stays freshest when stored in a dry, cool, dark place in an air-tight container. Black tea stored in a bag inside a sealed opaque canister may keep for two years. Green tea loses its freshness more quickly, usually in less than a year. Gunpowder tea, its leaves being tightly rolled, keeps longer than the more open-leafed Chun Mee tea. Storage life for all teas can be extended by using desiccant packets, oxygen-absorbing packets, vacuum sealing or store tea in closed containers in a refrigerator.

When storing green tea, discreet use of refrigeration or freezing is recommended. In particular, drinkers need to take precautions against temperature variation.[79]

Improperly stored tea may lose flavour, acquire disagreeable flavours or odors from other foods, or become moldy.

See also

3

References

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Bibliography

Martin, Laura C. (2007). Tea: The Drink that Changed the World. Tuttle Publishing. ISBN 0804837244.

Further reading

  • Jana Arcimovičová, Pavel Valíček (1998): Vůně čaje, Start Benešov. ISBN 80-902005-9-1 (in Czech)
  • Claud Bald: Indian Tea. A Textbook on the Culture and Manufacture of Tea. Fifth Edition. Thoroughly Revised and Partly Rewritten by C. J. Harrison. Thacker, Spink & Co., Calcutta 1940 (first edition, 1933).
  • Kit Chow, Ione Kramer (1990): All the Tea in China, China Books & Periodicals Inc. ISBN 0-8351-2194-1.
  • John C. Evans (1992): Tea in China: The History of China's National Drink, Greenwood Press. ISBN 0-313-28049-5
  • Forbes, Andrew ; Henley, David (2011). China's Ancient Tea Horse Road. Chiang Mai: Cognoscenti Books. ASIN: B005DQV7Q2
  • Jason Goodwin (1990). "The Gunpowder Gardens: Travels through India and China in Search of Tea." Re-issued on Kindle 2012 ASIN: B007YANR90; first published by Chatto & Windus (London) 1990; Knopf (New York) 1990; reissued by Penguin (2003).
  • Harler, C. R., The Culture and Marketing of Tea. Second edition. Oxford University Press, New York and Bombay, Reprinted 1958 (First edition 1933, second edition 1956).
  • Eelco Hesse (1982), Tea: The eyelids of Bodhidharma, Prism Press.
  • Hobhouse, Henry (2005). "Seeds of Change: Six Plants that Transformed Mankind". Shoemaker & Hoard. ISBN 1-59376-049-3. {{cite journal}}: Cite journal requires |journal= (help)
  • Karmakar, Rahul (13 April 2008). "The Singpho: The cup that jeers". Hindustan Times. New Delhi. p. 12..
  • Kiple, Kenneth F.; Ornelas, Kriemhild Coneè, eds. (2000). The Cambridge World History of Food. Vol. 1. Cambridge: Cambridge University Press. ISBN 0-521-40216-6..
  • Lu Yu (陆羽): Cha Jing (茶经) Translated and Introduced by Francis Ross. The Classic of Tea. Boston: Little, 1974. x, 177p. ISBN 0-316-53450-1; Reprinted: Ecco Press, 1997. ISBN 0880014164.
  • Victor H. Mair and Erling Hoh. The True History of Tea. New York; London: Thames & Hudson, 2009. ISBN 978-0-500-25146-1.
  • Roy Moxham (2003), Tea: Addiction, Exploitation, and Empire.
  • Nye, Gideon (1850). Tea: and the tea trade Parts first and second. New York: Printed by G. W. Wood.
  • Lester Packer; Choon Nam Ong; Barry Halliwell (2004): Herbal and Traditional Medicine: Molecular Aspects of Health, CRC Press, ISBN 0-8247-5436-0.
  • Jane Pettigrew (2002), A Social History of Tea
  • Jane Pettigrew (1999), Tea & Infusions: a connoisseur's guide. Carlton Books.
  • Pettigrew, Jane & Richardson, Bruce (2005). The New Tea Companion: a guide to teas throughout the world. Benjamin Press. ISBN 0-9663478-3-8.
  • James Norwood Pratt (2005), Tea Dictionary
  • Stephan Reimertz (1998): Vom Genuß des Tees: Eine heitere Reise durch alte Landschaften, ehrwürdige Traditionen und moderne Verhältnisse, inklusive einer kleinen Teeschule (In German)
  • Tunstall-Pedoe, M.; Tunstall-Pedoe, H. (1999). "Coffee and tea consumption in the Scottish Heart Health Study follow up: conflicting relations with coronary risk factors, coronary disease, and all cause mortality". Journal of epidemiology and community health. 53 (8): 481–487. doi:10.1136/jech.53.8.481. PMC 1756940. PMID 10562866.
  • Yang CS, CS (1999). "Tea and Health". Nutrition (Burbank, Los Angeles County, Calif.). 15 (11–12): 946–949. doi:10.1016/S0899-9007(99)00190-2. PMID 10575676. {{cite journal}}: Unknown parameter |month= ignored (help)
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