History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c37.s2.1
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c37.s2.1
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c37.s2.1
"The green vitriol or copperas of commerce, which is known to the natives as *kahi* and *hara kasis*, is produced principally from the so-called alum shales, from which alum is prepared. As is the case also with alum, copperas is found sometimes as a natural exudation upon alum shales and other rocks, which include iron pyrites.