colcotharn.

/ˈkɒlkəʊθa/

Forms: Also 1600s -chotar, -cotar, -kethor.

Etymology: Compare French calcatar , Portuguese calcatar and medieval Latin calcatar (also calcatar ), Spanish colcotar , < Arabic qolqotār (Pedro de Alcalá , 1505), thought by Dozy to be a corruption of Greek χάλκανθος or χαλκανθές chalcanth n.

a. The brownish red peroxide of iron which remains in the retort after the distillation of sulphuric acid from iron sulphate.It is used in medicine, in the mechanical arts, and in a finely powdered form by jewellers under the name of rouge; also called Crocus Martis.

ΘΚΠ

the world > matter > chemistry > elements and compounds > metals > specific elements > oxygen > [noun] > compounds > oxides > peroxides

foam of copperas1538

colcothar1605

peroxide1804

oxynitric gas1805

superoxide1807

oxynitric acid1810

hyperoxide1855

oxylithe1902

hydrogen peroxide1907

1605 T. Tymme tr. J. Du Chesne Pract. Chymicall & Hermeticall Physicke i. xiii. 53 The colchotar, or red feces which remayneth in the bottome.

1646 Sir T. Browne Pseudodoxia Epidemica vi. xii. 337 Colcothar or vitriol burnt, though unto a rednesse containing the fixed salt, will make good Inke.

1738 G. Smith tr. Laboratory i. 27 Take red calcined Vitriol or Colcothar [of vitriol].

1791 E. Darwin Bot. Garden: Pt. I i. Notes 52 The precipitates of gold, and the colcothar or other red preparations of iron, are called tender colours.

1832 G. R. Porter Treat. Manuf. Porcelain & Glass 209 The previously polished side is provided with a coating of red colcothar.

b. Formerly applied to analogous compounds of other metals.

ΚΠ

1617 J. Woodall Surgions Mate 285 This Colkethor is of two..kindes, the one is from the feces of Aqua fortis, and the other from coperas.

1652 J. French York-shire Spaw vi. 62 The Colcothar..yields upon a refiners tast most pure Copper like to very gold.

1681 Table of Hard Words in S. Pordage tr. T. Willis Five Treat. Colcothar, dross of metals.

This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2022).

单词	colcothar
释义	colcotharn. /ˈkɒlkəʊθa/ Forms: Also 1600s -chotar, -cotar, -kethor. Etymology: Compare French calcatar , Portuguese calcatar and medieval Latin calcatar (also calcatar ), Spanish colcotar , < Arabic qolqotār (Pedro de Alcalá , 1505), thought by Dozy to be a corruption of Greek χάλκανθος or χαλκανθές chalcanth n. a. The brownish red peroxide of iron which remains in the retort after the distillation of sulphuric acid from iron sulphate.It is used in medicine, in the mechanical arts, and in a finely powdered form by jewellers under the name of rouge; also called Crocus Martis. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > oxygen > [noun] > compounds > oxides > peroxides foam of copperas1538 colcothar1605 peroxide1804 oxynitric gas1805 superoxide1807 oxynitric acid1810 hyperoxide1855 oxylithe1902 hydrogen peroxide1907 1605 T. Tymme tr. J. Du Chesne Pract. Chymicall & Hermeticall Physicke i. xiii. 53 The colchotar, or red feces which remayneth in the bottome. 1646 Sir T. Browne Pseudodoxia Epidemica vi. xii. 337 Colcothar or vitriol burnt, though unto a rednesse containing the fixed salt, will make good Inke. View more context for this quotation 1738 G. Smith tr. Laboratory i. 27 Take red calcined Vitriol or Colcothar [of vitriol]. 1791 E. Darwin Bot. Garden: Pt. I i. Notes 52 The precipitates of gold, and the colcothar or other red preparations of iron, are called tender colours. 1832 G. R. Porter Treat. Manuf. Porcelain & Glass 209 The previously polished side is provided with a coating of red colcothar. b. Formerly applied to analogous compounds of other metals. ΚΠ 1617 J. Woodall Surgions Mate 285 This Colkethor is of two..kindes, the one is from the feces of Aqua fortis, and the other from coperas. 1652 J. French York-shire Spaw vi. 62 The Colcothar..yields upon a refiners tast most pure Copper like to very gold. 1681 Table of Hard Words in S. Pordage tr. T. Willis Five Treat. Colcothar, dross of metals. This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2022). < n.1605
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