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colcothar
col·co·thar C0469000 (kŏl′kə-thər, -thär′)n. A brownish-red ferric oxide obtained as a residue after heating ferrous sulfate, used in glass polishing and as a pigment.
[Medieval Latin, from Spanish colcótar, from Arabic qulquṭār, possibly from Greek khalkanthos, copper sulfate : khalkos, copper + anthos, flower.]colcothar (ˈkɒlkəˌθɑː) n (Elements & Compounds) a finely powdered form of ferric oxide produced by heating ferric sulphate and used as a pigment and as jewellers' rouge. Also called: crocus [C17: from French colcotar, from Spanish colcótar, from Arabic dialect qulqutār]colcothar
colcothar[′käl·kə‚thär] (inorganic chemistry) Red ferric oxide made by heating ferrous sulfate in the air; used as a pigment and as an abrasive in polishing glass. MedicalSeecrocus |