The Compendium of Caraka 7.1.13_2

7.1.13_2

yāni pakvānyakāṇānyaharitāni pāṇḍūnyakrimīṇyapūtīnyajantujagdhānyahrasvāni; tāni &pramṛjya, kuśapuṭe baddhvā, gomayenālipya, yavatu(bu)ṣamāṣaśālikulattha-&mudgapalānāmanyatame nidadhyādaṣṭarātram/

Those that are ripe, undamaged, not green, pale, free of worms, not putrid, not eaten by insects, and not stunted—having wiped them clean, bound them in a packet of kuśa grass, smeared them with cow dung, one should place them inside any one of barley chaff, black gram, śāli rice, horse gram, or green gram straw for eight nights.