A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c12.t3.63
A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c12.t3.63
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v1.c12.t3.63
Rājāvarta (Lapis lazuli) has a bluish tint but with slight admixture of red.........it is killed by being powdered in combination with lemon juice and sulphur and roasted 7 times in a covered crucible.