Anandakanda 1.23.85

1.23.85

tadbhasma divyaṃ yuñjīta sadā roge rasāyane /
<saptadaśaḥ prakāraḥ>
svajīrṇe pārade svarṇaṃ samamamlena mardayet //

One should always employ that divine calx in disease and rejuvenation therapy.
<The Seventeenth Method>
When gold is digested in mercury itself, he should grind it with an equal [part of] sour [gruel].