Anandakanda 2.6.8

2.6.8

mardayitvā caredbhasma tadrasādiṣu kīrtitam /
<vaṅgaśuddhi (2)>
nāgavacchodhayed vaṅgaṃ tadvadaśvatthaciñcayoḥ //

Having ground it, he should make ash; that is praised in mercury [processes] and the rest.
<Purification of tin (2)>
He should purify tin like lead; likewise with ash of peepal and tamarind;