Minerals and Metals in Ancient India v1.c26.s4.7

v1.c26.s4.7

∗∗ The second century AD text *Rasaratnākara* of Nāgārjuna mentions (1.3) “What wonder is it that calamine (zinc ore) roasted thrice with copper converts the latter into gold”. This is an allusion to the making of yellow gold-like cementation brass. The same text (1.31-32) also refers to the reduction-distillation of calamine yielding zinc : “an essence of the appearance of tin”.