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jewelers' rouge

 - 2 dictionary results

col⋅co⋅thar

[kol-kuh-ther]
–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.


Origin:
1595–1605; < ML < OSp colcotar, SpAr qulquṭār, perh. < Gk chálkanthos copper sulfate solution
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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