The Jewel Mine of Mercury

...mercury is poison; therefore, the purification of mercury is performed. ...one hundred units of measure in the constellations... five hundred... not to be done; the best purification of mercury... With the Aghora mantra, for the protection of the mercury, Arjuna and others...
Aghora mantra

Salutations to those who are Aghora not terrible, and those who are Ghora terrible, and those who are more terrible than the terrible. Salutations to all of them, in all forms of Rudra. We know that person, we meditate on the Great God; may that Rudra impel us. Shri... In the Rasaratnākara composed by Nityanatha Siddha, the son of Parvati, in the Rasa-khanda Section on Mercury, the first chapter called Rasa-pīṭhikā The Mercury Pedestal/Foundation.
Now the characteristics of the khalla mortar are described. There, the characteristic of the mortar is: that which is not pure, has not reached the mind, is faint, and is bound by sulfur; it is not diamond, it is not killed, it is not sky-tinctured, nor is it seven-fold pure. Gold and other metals and even poison, when they are not born from the oil-cooking method, should be given there. It becomes famous; it is to be praised in the circle of the intelligent. Now, the method for removing defects from mercury: Now I shall describe the removal of the eight defects. With the powder of Shikhikari Plumbago zeylanica and turmeric, in one-sixteenth part of the mercury, with the heat of the sun, for one day in a mortar made of iron or stone. In goat urine, one should throw three times... having stood upon that, this mortar is remembered. One should wash the mercury with sour gruel kañjika; it releases the defect of lead.