Da Vinci Oil Paint are made with the finest grade of alkali-refined linseed oil available. This type of oil is well-noted for excellent color stability. "Straw" in color, it has a minimal effect on pigment colorization and will not darken with age. In certain colors, such as the whites, flesh colors, ice blue, and light brilliant yellow, we use safflower oil. With these sensitive pigments that yellow easily, this oil produces a much better non-yellowing color.