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colcotharCOLCOTHAR, n. The brown red oxyd of iron which remains after the distillation of the acid from sulphate of iron; used for polishing glass and other substances. It is called by artists crocus, or crocus martis. |
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colcotharCOLCOTHAR, n. The brown red oxyd of iron which remains after the distillation of the acid from sulphate of iron; used for polishing glass and other substances. It is called by artists crocus, or crocus martis. |