Anandakanda 2.6.10

2.6.10

uddhṛtya daśamāṃśena tālena saha mardayet /
<vaṅgaśuddhi (3)>
pūrvadrāvaiḥ sahāloḍya ruddhvā gajapuṭe pacet //

Having extracted it, he should grind it with a tenth part of orpiment.
<Purification of tin (3)>
Having mixed it with the previous liquids, sealed, he should cook it in an elephant-pit furnace.