Anandakanda 1.24.111

1.24.111

mahāvartigataṃ dhmātaṃ khoṭaṃ bhavati sūtakaḥ /
taṃ khoṭaṃ śodhayetkācaṭaṅkaṇadravayogataḥ //

Placed in a great smelting-crucible and blown, the quicksilver becomes a solid mass. / One should purify that solid mass by the application of glass and borax fluid;