History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c18.s1.t3.7

6. *Mahānīla Taila* (CS.Ci. 26/270-272) is an oily iron compound in which *Tīkṣṇa Loha Cūrṇa* is added alongwith *Kāsīśa* (ferrous sulphate).

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