Rasarnava 12.119-

12.119-

athātastilatailena pācayecca dinatrayam
tathā śulvasya pattrāṇi vedhyaṃ jāmbunadaṃ bhavet //
rasaṃ raktasnuhīkṣīraṃ kunaṭīṃ gandhakābhrakam
daradaṃ caiva lohāni sahasrāṃśena vedhayet //

Then, one should cook [them] with sesame oil for three days;
likewise, sheets of copper will become transmuted into gold.
Mercury, red snuhī latex, realgar, sulfur, mica,
and cinnabar will transmute base metals at a thousandth part.