A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c13.s1.18
A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c13.s1.18
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v1.c13.s1.18
"Alum is also manufactured from the water of a hot spring north of Mhurr. The impure saltpetre, which is employed to supply the second base in the above-mentioned manner, is obtained by lixiviation of village refuse." (Ball's "Economic Geology", pp. 431-33).