The Compendium of Caraka 6.12.45

6.12.45

syādbhasmanastat salilena sādhyamāloḍya yāvadghanamapradagdham/
styānaṃ tataḥ kolasamāṃ tu mātrāṃ kṛtvā suśuṣkāṃ vidhinopayuñjyāt//

That [mass] should be cooked by stirring with ash-water until it becomes thick without burning. / When it has congealed, one should make pills of the size of a jujube, dry them thoroughly, and administer them according to rule.