1 colcothar | Definition of colcothar
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colcothar

noun
col·​co·​thar | \ ˈkäl-kə-ˌthär\
plural -s

Definition of colcothar

1 : a reddish brown iron oxide left as a residue when ferrous sulfate is highly heated and used formerly in polishing glass and as a pigment
2 : a moderate reddish brown that is yellower and deeper than roan, yellower, stronger, and slightly darker than mahogany, and yellower, less strong, and slightly darker than oxblood

— called also angel red, Coromandel, English red, Mars red, Prussian red, Tuscany

History and Etymology for colcothar

Medieval Latin, from Middle French or Old Spanish; Middle French colcotar, from Old Spanish cólcotar (now colcótar), from Arabic dialect qulquṭār, probably modification of Greek chalkanthos

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