Anandakanda 1.23.43

1.23.43

abhrādyuparasānāṃ ca yojanīyaṃ prayatnataḥ /
<pāradabhasmavidhiḥ; prathamaḥ prakāraḥ>
śuddhasūtaṃ śuddhagandhaṃ mardayedgoghṛtaiḥ samam //

and of secondary minerals like mica, it must be applied with effort. / <Method for incinerating mercury; First method> / One should grind purified quicksilver and purified sulphur in equal amounts with cow's ghee.