Mastering Color Mixing with Watercolors
By Isabelle Roelofs and Fabien Petillion
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About this ebook
Learn to create any color from a basic palette of just 11 colors!
What if you could create any color you wanted, from a basic palette of just 11 colors? That is what the art of color mixing is all about. And once you master it, you will be able to create a broad range of all the colors you might need. Your options will be limited only by your imagination.
In this color mixing book, Isabelle Roelofs and Fabien Petillion first walk you step by step through the basics of watercolor pigments, paper, and color mixing techniques. Using just 11 colors, you’ll learn to bring more variety to your primary colors, create basic colors (such as Payne’s Gray and Van Dyck Brown), and create your own secondary colors. This approach works no matter what brand of paints you use, as each of the 11 colors is identified by its universal pigment color (such as PY154).
Once you’re underway color mixing, you’ll see how four artists interpret that basic palette to create thematic color palettes tailored to different subject matter, such as flowers, landscapes, portraits, and animals. Finally, you’ll solidify your understanding of color mixing by analyzing five watercolor paintings to see how the color was achieved and how the painting was developed, layer by layer, to achieve the final result.
Isabelle Roelofs
Isabelle Roelofs is the founder of the Isaro brand of paints, specializing in the manufacture of colors for artists. Her unique knowledge has been in her family for four generations. Find Isabelle online at isaro.be, @isaro_watercolors_oil_paint (Instagram), and @CouleursIsaro (Facebook).
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Mastering Color Mixing with Watercolors - Isabelle Roelofs
1/Understanding a Watercolor
Basic Concepts
This chapter lays out some of the basic concepts that you will need in order to better understand the characteristics of watercolors, such as the nature of the pigments, their granularity, opacity, and transparency, and monopigment colors. We will then look at the specific characteristics of the 11 colors that we recommend you use in order to build up a balanced basic palette.
The Nature of Pigments
Watercolors are made from colored powders called pigments. These are mixed with a water-based binding agent consisting of gum arabic or dextrin. The formulation is completed with additives known for their qualities of plasticity and retaining moisture, such as glycerin and honey, as well as preservative agents.
Each pigment has intrinsic qualities that define what an artist can expect of a particular color. Opacity, transparency, granularity, and coloring power all depend on the nature of the pigments that are used in making the watercolors. This is why a good knowledge of the pigments that enter into the composition of watercolors will allow you to use them to their full potential.
Pigments fall into two main categories: mineral pigments and organic pigments. These two categories are then each also subdivided into two further categories: natural pigments and synthetic pigments. Nowadays, artists’ colors are mostly made using synthetic pigments, whose chemical composition is more or less complex.
MINERAL PIGMENTS
Earth tones and ocher colors are the only natural mineral pigments that are still used on an industrial basis today and that you will currently find in the assortment put out by color manufacturers.
The other mineral pigments, also called inorganic pigments, are produced artificially, based on metallic compounds. In a color chart, you will be able to find mineral-based pigments relatively easily. The name of the color indicates which metallic compound it contains, the most common ones being cobalt, titanium, zinc, cadmium, barium, chrome, nickel, and iron.
Watercolors based on mineral pigments are opaque and sometimes granular.
ORGANIC PIGMENTS
It is rare these days to find watercolors based on natural organic pigments. They are no longer manufactured industrially; they are only made artisanally
and are correspondingly expensive to buy. These pigments, of animal or plant origin, are mostly lacquers. Lacquers
means that the dyes contained in the organic matter have been extracted. Then this dye concentrate is combined with a neutral base (usually an aluminum or iron sulphate), which makes it possible to obtain a powdered color that can be used to make artists’ paints. Madder rose, cochineal carmine, indigo blue, and even cosmos orange are colors that will delight purists looking for more muted shades that will delicately complement each other. Remember that these watercolors are more sensitive to ultraviolet than are their synthetic counterparts. Works painted using these colors should therefore be kept away from too much exposure to light. A varnish or anti-ultraviolet glass will also help to protect the permanence of these colors.
NATURAL COLORS FROM THE LUTEA ASSORTMENT.
The manufacture of synthetic organic pigments, meanwhile, is based on the specific chemical properties of the carbon atom. These pigments are produced using the complex connection between carbon molecules and hydrogen molecules, nitrogen molecules, or sometimes (very rarely) also metallic compounds such as copper (in which case what we have then are organometallic pigments). They can be found in abundance in the color assortments of watercolor manufacturers. Their chemical compounds, which often have complicated names (dioxazine, quinacridone, diketopyrrolopyrrole, phthalocyanine, perylene), are seldom included in the name of the color. Referring to the pigment nomenclature given on the labels of color tubes will help you to identify these.
GRANULAR COLOR ON RAG PAPER CERULEAN BLUE (PB35 OR PB36)
NON-GRANULAR COLOR ON RAG PAPER ISARO ROSE (PR122)
GRANULAR COLOR MIXED WITH NON-GRANULAR COLOR ON RAG PAPER ISARO ROSE (PR122) + CERULEAN BLUE (PB35 OR PB36)
Synthetic organic pigments are highly valued in the manufacture of watercolors because they are transparent and their coloring power is often impressive. They also form uniform washes and only very rarely granulate.
Granularity
In watercolor painting, some colors provide uniform washes, as if they were just dyeing the paper, while others create an effect that looks like inlays.
This affect is accentuated on rag paper. From a technical standpoint, the granularity is related to the nature of the pigment. Even after careful grinding, some of the elementary particles of the pigments retain the tendency to clump and bond, which prevents an even distribution of the pigment. This produces varied washes, which are preferred by those who value colors with structured washes.
Mineral pigments, whose particles are not as fine as those of organic pigments, are more prone to granularity. Earth tones, ultramarines (blue, violet, and pink), cobalt-based colors (blue, green, and violet), emerald green, and manganese violet are the colors to choose if you would like to work with this effect.
COLORING POWER
Some pigments have a great deal of coloring power. Generally speaking, the smaller the pigment’s elemental particle, the stronger its coloring power will be. Synthetic organic pigments have finer pigment particles than mineral pigments do. These extremely fine pigments can very easily travel through and penetrate a paper’s fibers. Watercolors made using synthetic organic pigments therefore have a stronger coloring power than that of watercolors made up of mineral pigments. The pigment families of phthalocyanine, quinacridone, dioxazine, and DPP (diketopyrrolopyrrole) have an extraordinary coloring power, and once you have applied those colors to your paper, they are very difficult to erase and will not allow you much chance to change your mind.
Transparency and Opacity
The transparency of a color is connected to the structure of the pigment particles of which it is composed. If we look at them through a microscope, we will see that certain pigments, such as cadmiums and iron oxides, are very dense. Other pigments, however, will look almost translucent (phthalocyanine, quinacridone, Prussian blue (PB27)). In watercolors, it is important how you play with transparency. Keeping in mind that mineral pigments are opaque and that synthetic organic pigments are transparent will allow you to begin to imagine what you might be able to expect of a color. In order to make a more detailed study of the level of transparency of the colors that you already own, take the time to draw a black line on a piece of watercolor paper and to apply your colors to it, with very little dilution. The more the color lets the black line show through, the more transparent it is.
EVEN THOUGH SOME KINDS OF PAPER MAKE REMOVAL MORE POSSIBLE, MINERAL PIGMENTS (HERE ULTRAMARINE BLUE (PB29)) ARE EASIER TO ERASE THAN ORGANIC PIGMENTS (HERE ISARO ROSE (PR122) OR QUINACRIDONE ROSE).
AT LEFT, AN OPAQUE COLOR (CADMIUM RED); AT RIGHT, A TRANSPARENT COLOR (ISARO ROSE (PR122)).
Capacity for removal
Because of their solidity, some kinds of paper make removal more easily possible. These papers will allow you to go over the same area with a wet brush several times without pilling on the surface. Thus, you can allow the white of the paper, or a previously applied underlayer, to show through.
Monopigment Colors
Monopigment colors are colors made from a single pigment. The benefit of working with these colors is that in painting, we are subject to subtractive synthesis. You will surely already have noticed that the more you mix your colors, the more you lose in luminance or brightness, until finally, they will tend toward black. By choosing to paint with monopigment colors, you will be able to retain greater brightness as you create your secondary and tertiary colors.
Variations in Shade between Brands
Between one brand or manufacturer and another, the same color can have a different shade, even when you compare monopigment colors. Thus, even when referring to the same color name, the shades will change depending on the manufacturer.
The families of pigments often spread across a very broad