This document provides information on Gandhaka (sulphur) including its uses in Ayurveda, types, purification process, and synonyms. It states that Gandhaka is an important ingredient in Rasashastra and is used to treat various skin diseases and digestive issues. It occurs naturally near volcanoes and is found in deposits in India and other countries like the US. Proper purification of Gandhaka is needed before use to remove impurities that could otherwise cause harm.