All permanent with the highest resistance to fading. This collection of professional oil colors is formulated with the finest raw materials from around the world and is the only brand made using 100% ASTM pigments. Soft and creamy consistency using pure and refined linseed oil. Conforms to ASTM-4302. Transparency rating: T=transparent ST=semi-transparent O=opaque SO=semi-opaque.Sold by the each.