Anandakanda 1.7.23

1.7.23

ekāṃśaṃ pāradaṃ tasmin pakvabījena jāritam /
stanyena mardayettau dvau punar gajapuṭe pacet //

one part of mercury digested with a processed seed (bīja)— / one should grind both of them with breast milk and calcinate again in an elephant pit.