Gouache is one of those things no one talks about, or isn't talked about often for art journals. Some of us love our gouache, I'm one of them. Gouache is a watercolor-like paint that is opaque and can be layered like oil or acrylic to achieve a different sort of look from watercolors. It has a chalky finish that distinguishes it from watercolor.
It's often used (or was often used, before the advent of computers) by graphic designers to lay down a swatch of color that photographed well for ads. It's lovely matte finish lends itself to being photographed. When artists use it, the look can be totally changed.
It's a great tool for use in the art journal, and one of my favorites.
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