Gamblin Artists Oils are luscious, intense, pigment-rich colors that last. In fact, Robert Gamblin, a landscape painter himself, believes in making "permanent paintings". Every color is absolutely permanent and based on a specific, pure pigment with nothing extraneous added. Made with pure pigments and the finest refined linseed oil, each color retains the unique characteristics of its pigment, including tinting strength, undertone and texture. This allows painters to take advantage of the unique differences found in each pigment. Black Spinel Pigment: PBk28 Lightfastness: Excellent Transparency: Opaque (Matte)