Indicator System For Goods And Services

摘要

An indicator system with a blocked state and an unblocked state is disclosed. The indicator system may be used in conjunction with packaged products, packaging materials, medical products, films, biological assays and diagnostics, identification badges, and/or security passes. The indicator system responds to a triggering stimulus once unblocked. The respond is observable through a color change that may include a change form colorless to colored, colored to colorless, and/or colored to colored. The indicator system in its blocked state is substantially unreactive with the triggering stimulus.