A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c10.t22.2
A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c10.t22.2
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v1.c10.t22.2
Bitumen is produced from the following four metals: Gold, copper, silver and iron. Gold and other metals in the mountains, when heated by the sun, emit their impurities, oil-like, heavy and clay-like: these are the bitumen.