Cadmium red
Composition and Properties of Cadmium Red
Cadmium red is cadmium sulfoselenide Cd(S,Se). Cadmium red contains between 15 to 30% (and more) selenium. The variations are solid solutions of selenium sulfide in cadmium sulfide.It is stable as a pure pigment. The occurrences of bleaching or darkening in the beginnings of its use were due to impurities. The pigment is lightfast and there are no reports to the contrary. It is not compatible with lead and copper-containing pigments as they form dark sulfides of lead or copper.
Names
Cadmium sulfoselenidePR 108, CI 77202Word coined in Modern Latin from cadmia, a word used by ancient naturalists for various earths and oxides (especially zinc carbonate), from Greek kadmeia “Cadmean (earth),” from Kadmos “Cadmus,” legendary founder of Boeotian Thebes. So called because the earth was first found in the vicinity of Thebes (Kadmeioi was an alternative name for “Thebans” since the time of Homer).From WordFinder
Preparation of Cadmium Red
Cadmium orange and red can be prepared by a reaction of a solution of a cadmium salt, such as cadmium chloride, with a solution of sodium sulfide and sodium selenide in the desired proportion.
History of Use
Cadmium pigments have been in use since about 1840 until today. They might get banned in the European Union in the next future because of their toxicity.Example of use
