History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c13.s2.t3.15

v1.c13.s2.t3.15

Since liquid lead readily alloys with silver one of its major use was to first produce this alloy by coreduction of Pb and Ag minerals and then produce pure Silver by the process of cupellation. Bhardwaj writes that these processes were known during the Harappan period.