Minerals and Metals in Ancient India v2.c45.s4.2

v2.c45.s4.2

Four varieties of sulphur were known: red or *śukacancunibha*, yellow or *śukapiccha*, white variety, good for reaction with iron, and black sulphur which may be used as an anti-bacterial medicine. Sulphur was purified by boiling or melting in milk and filtration (3.20-3.22).