History of Chemistry in Ancient and Medieval India, Incorporating the History of Hindu Chemistry by Acharya Prafulla Chandra Ray c39.s6.4

c39.s6.4

Of these Earth-substances, some were known to be compounds; e g., the chemical salts of the metals, collyrium etc. Susruta describes the preparation of the metallic salts. The leaves of the metals were pasted over with the salts, and then roasted. These metallic salts are therefore *mono-bhautic* Earth-compounds. Susruta also gives the preparation of mild and caustic alkalies.