Dietary Rules, Purification (Śauca), and the Duties of the Householder and Forest-Dweller
नागदन्तास्थिशृङ्गाणां तक्षणाच्छुद्धिरिष्यते पुनः पाकेन भाण्डानां मृन्मयानां च मेध्यता
nāgadantāsthiśṛṅgāṇāṃ takṣaṇācchuddhiriṣyate punaḥ pākena bhāṇḍānāṃ mṛnmayānāṃ ca medhyatā
For ivory, bone, and horn, purification is accepted as arising from scraping/paring. And for earthen vessels, fitness (for use) is restored again by re-firing (heating/baking).
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Purification is defined as removal or transformation of the contaminated surface: scraping removes the affected layer; re-firing transforms the clay and symbolically ‘renews’ the vessel.
Ancillary ācāra/dharma material, not pancalakṣaṇa narrative cosmology or genealogy.
Scraping implies discernment—discarding the tainted outer accretion; fire (pāka) is the archetypal purifier, representing tapas-like transformation that restores ritual usability.