Rasendracudamani 11.9

11.9

gavyājyairvidruto vastragālitaḥ śuddhimṛcchati /
evaṃ saṃśodhitaḥ so'yaṃ pāṣāṇānambare tyajet //

Melted with cow's ghee and filtered through a cloth, attains purification.
Thus purified, it casts off stones on the cloth;