Rasendracudamani 14.114

14.114

[Medicinal use of dead iron:]
This non-revertible ash of iron is indeed a divine nectar, a fully perfected rasāyana; combined with trikaṭu, viḍaṅga, ghee, and honey,
taken in the dose of a niṣka, it destroys old age, death, and diseases, and bestows good sons; it was taught of old by glorious Giriśa to the father of Kālayavana for his prosperity.