Raseśvara was a philosophical tradition which arose around the commencement of Christian era. It advocated the use of mercury to make the body immortal. This school was based on the texts Rasārṇava, Rasahṛidaya and Raseśvarasiddhānta, composed by Govinda Bhagavat and Sarvajña Rāmeśvara.
Raseśvaras, like many other schools of Indian philosophy, believed that liberation was identity of self with God and freedom from transmigration. However, unlike other schools, Raseśvaras thought that liberation could only be achieved by using mercury to acquire an imperishable body. Hence, they called mercury pārada or the means of conveyance beyond transmigratory existence. Extrication of soul to Raseśvaras was a cognizable act and therefore, for liberation it was necessary to maintain an imperishable bodily life. They used scriptural evidence from the Purusha Sukta and Puranas to support this point of view.
Mercury was sacred to the Raseśvaras, so much so that they considered disparaging mercury blasphemy. Rasahṛidaya mentions mercury to be a creation by Shiva and Gauri whereas, Rasārṇava holds the worship of mercury to be more beatific than the worship of all symbols of Shiva. Raseśvaras described eighteen methods of treating mercury — sweating, rubbing, swooning, fixing, dropping, coercion, restraining, kindling, going, falling into globules, pulverising, covering, internal flux, external flux, burning, colouring, pouring, and eating it by parting and piercing it. Mercury could applied to both blood and body.
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