Anandakanda 2.1.121

2.1.121

vyomavadvaṅkanālena sattvaṃ śulbanibhaṃ bhavet /
<saptamaḥ prakāraḥ>
snuhīkṣīrair gavāṃ kṣīrair bhāvyam eraṇḍatailakaiḥ //

Through a curved blowpipe, as in the case of mica, the essence will become copper-like.
<The seventh method>
Impregnated with snuhī latex, cow milk, and castor oil,