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In alchemy, chalcanthum, also called chalcanth or calcanthum, was a term used for the compound blue vitriol (CuSO4), and the ink made from it. The term was also applied to red vitriol (a native sulfate of cobalt), and to green vitriol (ferrous sulfate).
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|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chalcanthum". A list of authors is available in Wikipedia.|