Cadmium Yellow

Cadmium sulfide and a mixture of cadmium sulfide with cadmium selenide are commonly used as pigments in artist's paints. They have an excellent reputation for color permanence although this is partially based on two reasons which are not necessarily directly related to their properties:
# when introduced, there were hardly any stable pigments in the yellow to red range, especially orange and bright red was very troublesome, when the cadmium pigments replaced e.g. mercury sulfide (the original Vermilion ), the light-fastness was greatly improved,
# companies sell the cadmium-containing paints at premium price. Although the pigments are certainly more expensive, the premium price is often not fully justifiable, with reasons more in the marketing area then in the actual raw material cost.

Nowadays, the cadmium pigments have been partially replaced by Azo Pigments . These are similar in lightfastness to the cadmium colors and have the advantage of both being cheaper and non-toxic. With respect to lightfastness the lemon yellow cadmium pigment is an exception: the azo-variety is highly superior in light-fastness.

In some countries, such as Australia , consumer activists such as Michael Vernon were successful in banning the use of cadmium pigments in plastics that could be used for toy manufacture, owing to the toxicity of cadmium.

EXTERNAL LINKS

National Pollutant Inventory - Cadmium and compounds

Information About

Cadmium Yellow