Gouache is similar to watercolour paint, but it is opaque rather than transparent. Like watercolour, the pigment is bound with Gum Arabic but the particulars are larger and the ratio of pigment to binder is higher. Gouache paint perfect for adding areas of flat and brilliant colour especially in the field of illustration and design. Shop the top brands like Winsor & Newton, Caran D'ache and Schmincke.