Reeves Gouache is an opaque water colour that has been used traditionally by designers and graphic artists to create posters and other advertising materials. However, because of their strong, opaque colours and versatility they have also become extremely popular with artists. Gouache is also ideal for teaching colour mixing theory. Reeves Gouache Tube Set 18 The colour assortment in this pack are white, lemon yellow, medium yellow, orange red, flesh tint, brilliant red, crimson, violet, blue lake, ultramarine, leaf green, emerald, dark green, yellow ochre, burnt sienna, burnt umber, grey and black.