Anandakanda 2.2.25

2.2.25

evaṃ punaḥ punaḥ pākādaṣṭadhā mriyate dhruvam /
<svarṇabhasma (2)>
śuddhasūtasamaṃ gandhaṃ mākṣikaṃ ca sahāmlakaiḥ //

Thus, through repeated cooking eight times, it is certainly killed.
Gold ash (2):
Sulphur equal to purified mercury, and copper pyrites along with sour gruel;