The Compendium of Caraka 6.13.134

6.13.134

nīlinīṃ trāyamāṇāṃ ca sātalāṃ trivṛtāṃ vacām/
saindhavaṃ kālalavaṇaṃ pippalīṃ ceti cūrṇāyet//

Nīlinī, trāyamāṇā, sātalā, trivṛt, vacā, / rock salt, black salt, and pippalī: one should powder these;