Rasaprakashasudhakara 5.16

5.16

sūkṣmacūrṇaṃ tataḥ kṛtvā piṣṭvā haṃsapadīrasaiḥ
cakrākāraṃ kṛtaṃ śuṣkaṃ dadyādardhagajāhvaye //

Then, having made a fine powder and triturated it with the juices of haṃsapadī, / fashioned into disks and dried, one should subject it to half-elephant pits.