jewelers’ rouge


noun

  1. colcothar.

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.

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

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