Pure pigments and the finest refined linseed oil are used to make Gamblin Artists colors. Because no adulterants are used, each color retains the unique characteristics of the pigments, including tinting strength, undertone and texture. By using Artists oil colors painters can take advantage of the tinctorial and textural differences found in the subtle (and not so subtle) nuances of each pigment. They are made with either mineral-based pigments (inorganic colors) or with modern organic pigments. Mineral-based pigments produce the 19th century colors of the Impressionists. Modern organic pigments produce 20th century colors best for high key painting and bright tinting. Every color is absolutely permanent and exact - each color is based on a specific, pure pigment with nothing extraneous added.