Anandakanda 1.25.5

1.25.5

sadrave marditaḥ so'pi iti pākarasaḥ smṛtaḥ /
<piṣṭī>
arkāṃśatulyādrasato'tha gandhānniṣkārdhatulyāttruṭiśo'pi khalve /
arkātape tīvratare vimardyātpiṣṭirbhavetsā navanītarūpā //

Ground with liquids, it is regarded as "cooked mercury" (pākarasa). / <Paste> / From mercury equal to a part of the sun (twelve parts), and then from sulfur equal to half a niṣka, bit by bit in a mortar, / grinding in intense sunshine, it becomes a paste possessing the form of butter.