अशुद्धं छेदयेत् ॥ कZ_०२.५.११ ॥
aśuddhaṃ chedayet.
If it is impure, he should cut it (i.e., reject/deface it by cutting as an enforcement measure).
Cutting/defacing creates a visible compliance consequence, discouraging repeated attempts to pass debased metal into state channels.