Cadmium colours, discovered in Germany in 1817 by Stromeyer, were quickly adopted by artits, who appreciated their intensity and high tinting strength. All dry pigments designated as substitutes are made from a combination of synthetic organic pigments that reproduce the genuine pigment colour, but at a much lower price. Cadmium yellow substitute is a stable compound of inert, mononitrogenous “azo” pigments and extenders. Very lightfast, it is stable in all binders : oil, acrylic, watercolour, gouache. For fresco use only genuine cadmium colours.