History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c18.s3.t2.21

7. Tāpyādi Cūrṇa (Aṣṭ. Hṛ. Ci. 16/20-22) is a compound of silver and Rusted iron, also contains Tapya and Śilajatu indicated in Pāṇḍuroga.

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