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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.


colcothar

/ 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 calledcrocus
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of colcothar1

1595–1605; < Medieval Latin < Old Spanish colcotar, Spanish Arabic qulquṭār, perhaps < Greek chálkanthos copper sulfate solution
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Word History and Origins

Origin of colcothar1

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

The wooden disc is also employed for this purpose with putty, colcothar, or washed tripoli.

When the cork or wooden disc edged with hat felt is used for polishing, putty or colcothar is applied to it.

No additional colcothar after the first is required in this part of the process; but only a drop of water from time to time.

Emery with oil is used for grinding down, and tin-putty or colcothar for polishing.

Colcothar of Vitriol, and Crocus of Mars, are old names for red oxide of iron.

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