तदुभयं तापनिकषाभ्यां निह्शब्दोल्लेखनाभ्यां वा विद्यात् ॥ कZ_०२.१४.३२ ॥
tad ubhayaṃ tāpanikaṣābhyāṃ nihśabdollekhanābhyāṃ vā vidyāt
Ambos os tipos devem ser identificados por aquecimento e por teste na pedra de toque (touchstone), ou por testes de raspagem e gravação sem ruído.
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.