Anandakanda 2.7.26

2.7.26

tāmravanmāraṇaṃ teṣāṃ kṛtvā sarvatra yojayet /
mṛtāni lohānyamṛtībhavanti nighnanti yuktāni mahāmayāṃśca /
abhyāsayogāddṛḍhadehasiddhiṃ kurvanti rugjanmajarāvināśam //

Having performed their incineration like copper, one should employ them everywhere. / Incinerated metals become nectar; properly administered, they destroy great diseases. / Through habituation, they bring about the perfection of a firm body, and the destruction of disease, birth, and senescence.