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English-Thai Dictionary

colcothar

N สารประกอบ ที่ เหลือ จาก การ เผา เฟอรัส ซัลเฟต

Webster's 1828 Dictionary

COLCOTHAR

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. The sulphate of iron is called colcothar or chalcite, when the calcination has been carried so far as to drive off a considerable part of the acid.

Webster's 1913 Dictionary

COLCOTHAR

Col "co *thar, n. Etym: [NL. colcothar vitrioli, fr. Ar. qolqotar.](Chem. )

Defn: Polishing rouge; a reddish brown oxide of iron, used in polishing glass, and also as a pigment; -- called also crocus Martis.