Anandakanda 1.23.90

1.23.90

<aṣṭādaśaḥ prakāraḥ>
karṣatrayaṃ śuddhasūtaṃ karṣaṃ tāmrarajaḥ priye /
amlaiḥ saṃmardayedgāḍhaṃ dinaṃ khalve tato bhavet //

<The Eighteenth Method>
Three karṣas of pure quicksilver and a karṣa of copper powder, my dear,
he should grind vigorously with sour liquids for a day in a mortar; thereupon it becomes