1. Tag damage: Tamper-proof fragile tags will break or tear after being removed. Some residual tags will leave irreversible "VOID" markings on the surface, and the tag cannot be restored to its original, smooth state.
2. Surface residue: After the tag is removed, a sticky layer of adhesive will remain on the surface of the object it was applied to. Some of the residual adhesive will attract dust and turn black, creating a noticeable color difference from the surrounding clean area.
3. Re-application marks: Re-approved tags will show misaligned edges, partial lifting, and residual air bubbles on the surface, clearly different from a brand-new, smooth, and adhered tag. Some tags may also show localized wrinkles and deformation.
4. Failure of special structures: For device tags with tamper-proof locks, turning the corresponding screw will cause the tamper-proof white dot on the tag to shatter directly. Electronic tags with built-in tamper-proof switches will trigger an immediate failure warning and become unusable.
