Like gwash; it rhymes with squash.
It is a kind of watercolor, but gouache is heavier and more opaque, with greater reflective qualities.
Gouache
gouache. Gouache has more body and dries more slowly than watercolor paint. It is a good medium for creating bright colors and meticulous details and is often used for design and fine artwork.
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Gouache.
gouache
Gouache
Gouache is thinned with water to the consistency of condensed milk, then applied with a natural hair (sable...) brush to illustration board. Building up layers isn't a good technique with gouache because any wet paint will interact with existing layers of already dried paint.
Gouache (from the Italian guazzo, "water paint, splash") or bodycolor (the term preferred by art historians) is a type of paint consisting of pigment suspended in water. Gouache differs from watercolor in that the particles are larger, the ratio of pigment to water is much higher, and an additional, inert, white pigment such as chalk is also present. This makes gouache heavier and more opaque, with greater reflective qualities.
The Snail
Gouache
According to Wikipedia, the word "gouache" is defined as a form of colored paint which contains a special binding agent which enables it to be used in opaque painting forms.