A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c13.37
A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c13.37
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v1.c13.37
. . . Considerable quantities of blue vitriol (copper sulphate), alum, and copperas (iron sulphate) are manufactured from the decomposed slate and refuse of the mines. The slates are steeped in water, which is afterwards evaporated in large iron vessels, when the blue vitriol, is crystallized out, afterwards the alum, and lastly the copperas. Mr. Mallet found traces of nickel and cobalt in all three of these substances.