Anandakanda 1.23.93

1.23.93

karīṣāgnau bhavetsūtabhasma rogajarāpaham /
<ekonaviṃśaḥ prakāraḥ>
sūtaṃ svarṇaṃ vyomasatvaṃ samaṃ svarṇasamaṃ biḍam //

in a cow-dung fire; it becomes quicksilver calx, dispelling disease and senescence.
<The Nineteenth Method>
Quicksilver, gold, and mica essence in equal parts; bid salt equal to the gold;