Minerals and Metals in Ancient India v2.c45.s6.4

v2.c45.s6.4

Gold was categorised; it could be prākṛta (native), sahaja (natural), vahni-sambhūta (fire-produced), khani-sambhūta (from the mines) or rasendra-vedasanjāta (transmuted from a base metal). One method of purification was to heat gold leaf with salt and red ochre (5.2).