An identification label for permanently marking a metal or other etchable surface such as an automobile part with an identifying indicia is disclosed. The label has a protective cover sheet, a pressure sensitive adhesive irremovably affixed to the cover sheet, and a liner with a release coating removably...http://www.google.es/patents/US5346738?utm_source=gb-gplus-sharePatente US5346738 - Identification label with micro-encapsulated etchant
Identification label with micro-encapsulated etchant
