Arthashastra

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तस्य तापनम् अवध्वंसनं वा शुद्धिः । इति पिङ्कः ॥

They are detected by hammering the pieces when red hot---so much for confounding (pinka).

english translation

tasya tApanam avadhvaMsanaM vA zuddhiH । iti piGkaH ॥

hk transliteration by Sanscript