Jewelers rouge

jewelers' rouge

noun Unabridged


noun Chemistry.
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.
Also called jewelers' rouge.

1595–1605; < Medieval Latin < Old Spanish colcotar, Spanish Arabic qulquṭār, perhaps < Greek chálkanthos copper sulfate solution Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
colcothar (ˈkɒlkəˌθɑː)
Also called: crocus a finely powdered form of ferric oxide produced by heating ferric sulphate and used as a pigment and as jewellers' rouge
[C17: from French colcotar, from Spanish colcótar, from Arabic dialect qulqutār]

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