It is made with intense concentrations of large pigments.
Because of this, gouache is often referred to as opaque watercolor. Gouache is very similar to watercolor paint in its composition but is designed to be opaque and dries to a flat finish. Gouache is mostly opaque and dries to a flat finish. You can see swatches of the Kuretake Gansai Tambi paints in this video. Not all paints list what binder they use, but Kuretake Gansai Tambi watercolors specify that they are not made with animal products. This can give gansai a glossier finish than Western watercolors, especially in areas where they were applied heavily. The traditional binder is animal glue, but these days gansai can be made with beeswax, sugar, and other binders. Gansai are not usually bound with gum arabic. They also tend to be made with more intense pigments for extra vibrancy.
This makes them both more opaque and easier to lift, as the larger pigments block more of the paper and don’t penetrate as far into the surface. They are made with larger pigments than Western watercolors.
They are designed to be used in a single layer on absorbent washi paper rather than in multiple layers, but they can still be used that way. Gansai are traditional Japanese watercolors. Gansai are slightly more opaque than Western watercolors. Both these and gouache are sometimes referred to as opaque watercolors, but gouache is made with larger pigments. Other paints are made more opaque with additives. Certain pigments, especially earth minerals like cadmium red and yellow ochre, naturally make more opaque paints. Some watercolors are less transparent than others. You can also cover areas that need to stay light with masking fluid to protect them from stray paint. You may be able to lighten dark areas with lifting if you accidentally put down a dark color too early, but this is only somewhat effective. Light colors are not opaque enough to cover previous layers, so they must be applied before dark colors and then carefully avoided for the rest of the painting. The small particles spread evenly over the paper to make smooth washes and allow the color of the surface below to show between each particle.Īlthough watercolors’ transparency can result in beautifully luminous artwork, it also limits how they can be used. These qualities come from the size of its finely ground pigments. Watercolor paint is known for its transparency, as well as its ability to form delicate washes and develop complex shading by building up many different layers of color. Watercolor paint has a beautifully tranparent quality. Not all manufacturers list what additives they use, but artist quality paints usually have more pigment relative to additives than student paints. Paints with dispersants or a high proportion of humectant can penetrate more deeply into the paper fibers and resist lifting. Paints with brighteners look more colorful in the pan and when wet, but they are typically more opaque and develop a faded or chalky appearance when dry. This can make the paints less expensive or tone down intense pigments so that they are easier to use with other paints in the same product line.Īlthough some additives are necessary, they can have side effects. Other additives “stretch” the paint so that it contains less pigment. Some common additives are humectants to keep the paint moist, preservatives to prevent mold, brighteners to make the paint more vibrant, and dispersants to help the pigment spread out in water. These paints also contain additives, which vary considerably between product lines and even between individual paints in the same line.
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