Anandakanda 1.9.19

1.9.19

lepayedvajramūṣāyāṃ tatra pūrvaṃ rasaṃ kṣipet /
tryahaṃ tuṣāgninā pācyaṃ haṃsapādīdravaiḥ punaḥ //

One should smear it onto a vajra-crucible and first throw the mercury in there. / It should be cooked over a chaff fire for three days, and again with haṃsapādī liquid