Anandakanda 2.1.96

2.1.96

eraṇḍatailasaṃyuktaiḥ puṭe pacyanviśodhayet /
<dvitīyaḥ prakāraḥ>
mākṣikasya trayo bhāgā bhāgaikaṃ ṭaṅkaṇasya ca //

combined with castor oil, [and] cooking it in a pit kiln, one purifies it.
<The second method>
Three parts of mākṣika and one part of borax,