colcothar

[kol-kuh-ther]
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.

Origin of colcothar

1595–1605; < Medieval Latin < Old Spanish colcotar, Spanish Arabic qulquṭār, perhaps < Greek chálkanthos copper sulfate solution
Also called jewelers' rouge.
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British Dictionary definitions for colcothar

colcothar

noun
  1. a finely powdered form of ferric oxide produced by heating ferric sulphate and used as a pigment and as jewellers' rougeAlso called: crocus

Word Origin for colcothar

C17: from French colcotar, from Spanish colcótar, from Arabic dialect qulqutār
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