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 12 The colour assortment in this pack are white, lemon yellow, medium yellow, brilliant red, crimson, blue lake, ultramarine, leaf green, emerald yellow ochre, burnt sienna and black.