Holbein Acryla Gouache moves, reacts, blends and feels like traditional gum arabic gouache. Holbein Acryla Gouache is water resistant when dry, and dries to a velvet matte finish. Holbein Acryla Gouache does not shift in colour tone from liquid to dry colour. What you see wet is what you get once dry. Set contains 18 x 12ml Colours.