Anandakanda 1.23.200

1.23.200

tato gajapuṭe deyaṃ samyagbaddho bhavedrasaḥ /
<navamaḥ prakāraḥ mūlikābandhaḥ>
ekavīrādravairmardyaṃ dinaṃ śuddhaṃ tu sūtakam //

Then it should be placed in an elephant pit furnace; the mercury becomes properly bound.
<Ninth method of herbal fixation>
Pure quicksilver should be ground for a day with the juices of ekavīrā.