Winsor & Newton Designer's Gouache is a finely ground, water based paint, well suited to illustration with pen, brush, or airbrush.All Designer's Gouache colours are fully compatible with Winsor & Newton Artists' and Cotman watercolorsGouache differs from watercolour in that the particles are larger, the ratio of pigment to water is much higher, and an additional, inert, white pigment such as chalk may also be present. This makes gouache heavier and more opaque, with greater reflective qualities.The set contains:Zinc White, Yellow Ochre, Ultramarine, Spectrum Red, Primary Yellow, Primary Red, Primary Blue, Permanent Yellow Deep, Ivory Black and Permanent Green Medium.