Rasavātam
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Rasavātam (lit., the way of Mercury ) was a form of alchemy in early India. The practice was done mainly with herbs, drugs, and prepared medicines. This approach was different from the traditions of alchemy found in medieval Europe.
Sulphides of Mercury are traditionally used in Rasavātam and Ayurveda to cure disease and prolong life. One such preparation is named thanga baspam and claimed to extend human life span.