ng concealed information, photoerasable paint for temporary markings on terrain and structures such as signs, roadways, trees, and buildings,...http://www.google.fr/patents/US6060223?utm_source=gb-gplus-shareBrevet US6060223 - Plastic article for colored printing and method for printing on a colored plastic article Recherche avanc???e dans les brevets Num???ro de publicationUS6060223 AType de publ