History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c37.s1.25
History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c37.s1.25
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c37.s1.25
The manufacture of alum in Cutch from a pyritous dark-grey or black shale in large quantities had also been in vogue for a long time. It is stated that before 1818 the exports of alum from this source amounted in some years to several thousand tons. These mainly went to Guzerat and Bombay to be employed in dyeing. The process has been described as follows: