Anandakanda 1.7.164

1.7.164

karābhyāṃ ghaṭṭayed gāḍhaṃ sūkṣmaṃ tatkāñjike sravet /
tat kuryād ātape śuṣkam etad dhānyābhrakaṃ smṛtam //

one should knead it forcefully with both hands, so the fine powder oozes out into that sour gruel. / One should dry that in the sun; this is known as grain-mica.