METHOD AND APPARATUS FOR CANCELLATION OF POSTAGE STAMPS - (SPECIFICATION 1)

摘要

This invention provides a method of processing postal items and an apparatus, as well as a postage stamp (13) having a active substance on the surface or imparted to the postage stamp (13) making material reacts in a pre-determined manner changing one or more properties when subjected to an intentionally created condition such as a low power laser (14), preferably low power CO2 laser to effect cancellation of the postage stamp (13) by marking the surface (11) thereof.