Rasarnava 11.57

11.57

hema sīsaṃ tu saṃghṛṣya rasaṃ tatra pradāpayet
nāgahemayutaṃ vyoma samajīrṇaṃ drutaṃ bhavet
abhrakoparasān kṣipraṃ mukhenaiva caratyayam //

Having ground gold and lead, one should add mercury to it; / mica combined with lead and gold becomes liquefied when equally digested; / it quickly moves mica and secondary minerals through its mouth alone.