History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c37.s2: Iron Sulphate
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c37.s2
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Iron Sulphate
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.
c37.s2.2
"This native copperas goes by several different names in India according to the nature of the other substances with which it is combined.
c37.s2.3
"In the year 1833, Mr. J. Stevenson published an analysis of native sulphate of iron obtained from Bihar, which was used at that time by the native dyers of Patna.
c37.s2.4
Analytical results:—
c37.s2.5
| Iron sulphate | .........39.0 per cent. |
| Iron oxide | .........36.0 „ |
| Magnesia | ........ 23.0 „ |
| Loss | ...... .. 2.0 „ .” |
c37.s2.6
—Ball, loc. cit., p. 419.