तदुभयं तापनिकषाभ्यां निह्शब्दोल्लेखनाभ्यां वा विद्यात् ॥ कZ_०२.१४.३२ ॥
tad ubhayaṃ tāpanikaṣābhyāṃ nihśabdollekhanābhyāṃ vā vidyāt
त्या दोन्ही प्रकारांची ओळख ताप देऊन व निकष (टचस्टोन)ने, किंवा आवाज न करता खरवडणे व कोरणे/रेषांकन यांच्या चाचणीने करावी.
Because surface treatments (leaf, polish, color enhancement) can defeat any single method; layered verification reduces false acceptance.
Institutionalize standardized assay procedures and require objective tests (not mere appearance) before accepting, storing, or paying out precious metals.