Art Advantage - 18 Color Gouache Set - 12ml tubes - Perfect size for trying a new medium or as travel set. All Art Advantage paint sets offer good light fastness and covering power. Gouache sets manufactured using only quality pigments. Art Advantage Gouache colors are traditional water based opaque colors, which give flat, smooth washes. Good tinting strength and a uniform matte finish. Thin, redissolve or clean up with water.