Anandakanda 1.23.146

1.23.146

evaṃ kuryāttrivāraṃ ca gandhapiṣṭir bhaved dhruvam /
<pañcamaḥ prakāraḥ>
snehalipte khalvamadhye śuddhasūtaṃ palaṃ nyaset //

One should do thus three times, and a sulphur paste will certainly be produced.
<Fifth method>
Inside a mortar smeared with unctuous substance, one should place one pala of purified quicksilver.