Anandakanda 2.7.24

2.7.24

rūkṣaṃ rucyaṃ kṛmighnaṃ ca netryaṃ malaviśodhanam /
<pittalādīnāṃ śodhanabhasmavidhiḥ>
trikṣāraṃ pañcalavaṇaṃ saptadhāmlena bhāvayet //

It is dry, appetizing, vermifuge, beneficial for the eyes, and cleanses impurities. / <Purification and incineration of brass and related metals> / One should levigate the three alkalis and the five salts seven times with sour liquid.