Anandakanda 1.4.398

1.4.398

etadbījaṃ rasendrasya garbhe dravati mardanāt /
<caturthaḥ prakāraḥ>
suvarṇasya samaṃ tāpyasatvamāvartayettataḥ //

This seed dissolves within the interior of the lord of mercury by trituration.
<Fourth Method>
Then one should melt pyrites essence equal to gold;