Rasarnava 6.136

6.136

vaikrāntaṃ vajrakandaṃ ca peṣayed vajravāriṇā
māhiṣe navanīte ca sakṣaudraṃ piṇḍitaṃ tataḥ
śodhayitvā dhamet sattvam indragopasamaṃ patet //

One should grind vaikrānta and vajrakanda with vajra-water, / and then form it into a lump with buffalo butter and honey; / having purified it, one should blow it: the metallic essence falls out resembling a cochineal insect.