Anandakanda 1.7.122

1.7.122

nirutthaṃ tadbhavedbhasma devi yojyaṃ rasāyane /
<lhohabhasmano'mṛtīkaraṇam>
yāvatsyāttriphalā tasmād bhavedvāri caturguṇam //

That calx becomes non-revivable, O goddess, [and] is to be employed in rasāyana.
<Nectarization of iron calx>
As much triphalā as there is, four times that amount of water should be taken;