The invention provides molded, extruded or formed phosphorescent plastic articles having laser marked indicia and methods for preparing the articles. The indicia may be seen as a contrast against a phosphorescent background or, alternatively, the indicia may themselves be phosphorescent. An article of...http://www.google.de/patents/US6118096?utm_source=gb-gplus-sharePatent US6118096 - Laser marking of phosphorescent plastic articles
