तस्य तापनमवध्वंसनं वा शुद्धिः । इति पिङ्कः ॥ कZ_०२.१४.४२ ॥
tasya tāpanam avadhvaṃsanaṃ vā śuddhiḥ | iti piṅkaḥ
For that «piṅka»-class item, purification is by heating or by complete destruction/removal—thus is (the method/class) piṅka.
It raises the expected cost of adulteration: if salvage is disallowed, counterfeiters risk total loss, strengthening deterrence and protecting state revenue.