Anandakanda 1.4.33

1.4.33

mardayettaptakhalve ca mūṣāyāṃ taṃ rasaṃ kṣipet /
nirudhya bhūdhare yantre vipacettaṃ punaḥ priye //

One should grind it in a heated mortar and cast that mercury into a crucible; / sealing it, my dear, one should bake it in a bhūdhara apparatus again.