Anandakanda 1.26.43

1.26.43

<9. garbhayantram>
sthālyāṃ vinikṣipya rasādivastu svarṇādi khoryāṃ pravidhāya bhūyaḥ /
amlena cordhvaṃ lavaṇāni dattvā cullyāṃ pacettatpratigarbhayantram //

<9. Garbhayantra>
Having placed the mercury and other substances in a pot, and repeatedly placing gold and the rest in a small vessel, / and having added sour gruel and salts above, one should cook it on a hearth; this is the counter-garbha apparatus.