Watercolors are indeed the art of transparency but there is a strong movement to gouache, which has always been a favorite with illustrators the world over. Gouache (opaque watercolor) has only transparent binders so colors dry without shifting—a common problem with acrylics. Gouache may be reworked because the paint film is not permanent until sealed. Gouache may be used with liquid friskets and along the same range of techniques as used with transparent watercolors. Made with the finest pigments in high concentration to yield rich and brilliant results. All colors are lightfast and conform to ASTM D-4236 standards. Gouache Set of 18 - 12 ml tubes. Colors include: Vermillion, Ultramarine Blue, Yellow Ochre, Lemon Yellow, Titanium White, Mixing White, Yellow Middle, Cerulean Blue, Viridian, Sap Green, Burnt Sienna, Burnt Umber, Crimson Red, Green Pale, Lamp Black, Mauve, Rose and Pussian Blue.