초록

Display information is revealed from behind a metal film that can be cleared upon effective contact with a clearing agent. The metal film, while opaque, is generally less than 1000 Angstroms thick and can be cleared by exposure to innocuous agents including food or other household products.

대표청구항 ▼

[ We claim:] [1.]1. A method of displaying information with an irreversible display comprising the steps of:adding a chemical agent to a metal film;producing a localized electrochemical reaction between the chemical agent and the metal film without generating an electromotive force beyond the chemic

[ We claim:] [1.]1. A method of displaying information with an irreversible display comprising the steps of:adding a chemical agent to a metal film;producing a localized electrochemical reaction between the chemical agent and the metal film without generating an electromotive force beyond the chemical agent;clearing the metal film by the localized electrochemical reaction with the chemical agent; andrevealing information through an opening cleared in the metal film by the reaction with the chemical agent.