Colcothar



[kol-kuh-ther] /ˈkɒl kə θər/

noun, Chemistry.
1.
the brownish-red oxide of iron produced by heating ferrous sulfate: used chiefly as a pigment in paints and theatrical rouge, and as a polishing agent.
/ˈkɒlkəˌθɑː/
noun
1.
a finely powdered form of ferric oxide produced by heating ferric sulphate and used as a pigment and as jewellers’ rouge Also called crocus

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