COLCOTHAR

(Lat.), n. n. Ko21'ko(ko2)-tha3r. Derived, perhaps, from the Arabic. Fr., c. [Fr. Cod.], sesquioxyde de fer anhydre [Fr. Cod.]. Ger., C., Englischrofh. Vitriolroth. It., colcotar. Sp., colcotar [Sp. Ph.]. A term first employed by Para cels us. Sesquioxide of iron formed by the calcination of ferrous sulphate. When strongly calcined, it is scarlet, and forms jeweler's rouge or polishing rouge; when le highly calcined, it is bluish and is used, under the name of crocus, for polishing metals. It has the same medicinal properties as the other iron compounds, but is not now used medicinally except as a haemostatic. [B, 3; B, 5 (a, 24).] C. vitriol i. See C. [s. 341]