तदुभयं तापनिकषाभ्यां निह्शब्दोल्लेखनाभ्यां वा विद्यात् ॥ कZ_०२.१४.३२ ॥
tad ubhayaṃ tāpanikaṣābhyāṃ nihśabdollekhanābhyāṃ vā vidyāt
这两类都应通过加热与试金石(touchstone)检验来识别,或通过无声刮削与刻划测试来辨别。
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.