History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c15.s2.49
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c15.s2.49
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c15.s2.49
Varahamihira (circa 550 A.D.) has also given some empirical recipes about the hardening of steel (*sastrapāna*) :