Anandakanda 1.24.186

1.24.186

sa raso jāyate devi mūrchito rañjito bhavet /
<tṛtīyaḥ prakāraḥ>
rasārdhaṃ gandhakaṃ mardyaṃ yāmayugmaṃ kharātape //

That mercury becomes swooned [and] colored, O goddess. / <The third method> / Half as much sulfur as mercury is to be ground for two watches in fierce sunshine.