Permanent, yellow pigment containing cadmium. Earliest pigments were composed of cadmium sulfide, synthetically prepared in Germany by Friedrich Strohmeyer in 1817. Variations in particle size and chemical composition produce as range of colors from light yellow to orange. In the 1920s, the cadmium pigments were co-precipitated with barium sulfate to form the cheaper cadmium lithopone (cadmopone) pigments. (en)