Anandakanda 1.4.401

1.4.401

<pañcamaḥ prakāraḥ>
tāpyatulyaṃ ca sindhūtthaṃ mardayedamlakena ca /
tatsaṃpuṭe puṭe pacyāt punaḥ saṃmardayet puṭet //

<Fifth Method>
One should triturate rock salt equal to pyrites with sour gruel,
and cook it in an enclosed vessel in an incineration pit; one should triturate and incinerate again.