Anandakanda 2.8.122

2.8.122

<vajramṛdūkaraṇa (3)>
pāradaṃ tīkṣṇacūrṇaṃ ca dinamamlena mardayet /
tadgole nikṣipedvajraṃ sūtreṇāveṣṭayedbahiḥ //

One should rub mercury and fine iron powder with sour gruel for a day; / one should place the diamond inside that ball and wrap it on the outside with thread;