The Essence of Mercury

In the center, there is a circular hole; one should place the flask there. Inside the flask, one should make a clay [structure] shaped like a lid. (28)
So that the flask hangs and stays steady in the wheel apparatus chakra-yantra. Half of the apparatus goes below, and the other half is above. (29)
The best practitioner should light a fire below the apparatus. When the flask is smokeless, one should provide a seal on the opening. (30)
An increasing fire should be maintained for eight yama 24 hours. The essence moves to the upper part of the flask, pure. (31)
There is no doubt that one fifth part of essence is produced from orpiment. Thus, orpiment releases its essence; even the swan hamsa a metaphor for purified mercury or essence [is found] in the flask. (32)
Fats and sweating are not necessary for the extraction of the swan-essence. For those such as green vitriol kasisa, the essence extraction is like that of orpiment. (33)
Having taken sulfur, make it into a fine powder. Keep ghee in an iron vessel; put the sulfur into the ghee. (34)
Then, place it on charcoal until the sulfur melts. Pour the sulfur into milk, again and again. (35)
This process should be performed twenty-one times; it is the best purification of sulfur. Having taken out the purified substance, sweat it with effort. (36)
With the juice of navamallika Arabian jasmine, the juice of devadali, (37)
and with the milk of vajrarka a type of euphorbia, combined with the group of acids.
Sweated and ground, the sulfur surely becomes free of odor. Then sweat the sulfur with blood, fat, marrow, and milk. (38)