Anandakanda 1.15.5

1.15.5

pariśoṣyātape tīvre sūkṣmacūrṇāni kārayet /
dhātrīphalena saptāhaṃ bhāvayetpayasāthavā //

having dried them thoroughly in the fierce sun, one should make them into a fine powder.
One should triturate it with āmalakī fruit or with milk for seven days;