Anandakanda 1.10.12

1.10.12

samukhe pārade bījaṃ catuḥṣaṣṭyaṃśake kṣipet /
taptakhalve'mlavargeṇa mardayed divasatrayam //

Into mercury endowed with an opening, one should introduce the seed in a sixty-fourth part;
one should grind it in a heated mortar with the group of acids for three days.