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chalcanth
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Chalcanthum
In alchemy, chalcanthum, also called chalcanth or calcanthum, was a term used for the compound blue vitriol (CuSO4), and the ink made from it.
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chalcanthite
chalcanthite Min. (kælˈkænθaɪt) [named 1853; f. chalcanth-um + -ite.] Native blue vitriol or sulphate of copper.1857 Shepard Mineral. 441.
Oxford English Dictionary
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chalcanthum
† ˈchalcanth, chalˈcanthum Obs. Also c(h)alcanthus, calcanth. [a. F. calcante (Cotgr.), and L. c(h)alcanthum, -us, a. Gr. χάλκανθον, χάλκανθος ‘a solution of blue vitriol used for ink and blacking’, f. χαλκός copper + ἄνθος a flower.] An old name for blue vitriol (sulphate of copper), and for a kind...
Oxford English Dictionary
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colcothar
colcothar (ˈkɒlkəʊθa(r)) Also 7 -chotar, -cotar, -kethor. [So in F., Pg. and med.L. (also calcatar), Sp. colcotar, ad. Arab. qolqotār (Pedro de Alcalá, 1505), thought by Dozy to be a corruption of Gr. χάλκανθος or χαλκανθές chalcanth.] The brownish red peroxide of iron which remains in the retort af...
Oxford English Dictionary
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