Anandakanda 1.25.74

1.25.74

viniryāti sa nirdiṣṭaḥ pataṅgīrāgasaṃjñakaḥ /
<āvāpaḥ>
drute dravyāntarakṣepāllohādyaiḥ kriyate hi yaḥ //

is declared to be named pataṅgīrāga (pataṅgī tincture).
[Infusion]
That which is performed by metals and the like by throwing another substance into molten [metal]