Buy the Winsor & Newton Introduction to Fine Art Gouache Colour Set, 12ml at Michaels. com. Gouache provides excellent coverage. The set is perfect to become familiar with the medium and technique. Gouache provides excellent coverage. The set is perfect to become familiar with the medium and technique. This set includes ten 12ml Gouache tubes in opaque white, primary yellow, medium yellow, vermillion, primary red, ultramarine, primary blue, medium green, burnt sienna and black.