Schmincke ox gall for watercolor 200ml Ox gall is one of the main components in the creation of watercolors. Degreases the substrates for greater adhesion of the watercolor. Composition: surface active agent (synthetic) and water. It can be used pure or mixed with watercolor. Avoid pearling of the watercolor on the substrate. Provides better adhesion to waterproof substrates. Use sparingly to avoid excessive watercolor absorption Contains 200 ml. Brand: Schminke.