Gamblin Artists' Oils use only the purest pigments and finest refined linseed oil. Rather than copy any other style of paint-making, in 1980 Robert Gamblin developed his own and formulated colors with bold, rich and saturated results. Each color retains its original unique pigment characteristics like tinting strengths, undertones, and textures. Within this line, there are mineral-based (inorganic) pigments and modern organic pigments that render different results, creating a diverse and versatile range. The colors are completely non-toxic and use alkali-refined linseed oil and safflower oil as binders. Made in Portland, OR. Over 95 colors available in 37ml tubes. Select colors also available in 150ml tubes.