Applications of photoerasable colorant composition include photoerasable price markings for pricing goods, documents such as gaming tickets for securely communicating concealed information, photoerasable paint for temporary markings on terrain and structures such as signs, roadways, trees, and buildings,...http://www.google.es/patents/US6120949?utm_source=gb-gplus-sharePatente US6120949 - Photoerasable paint and method for using photoerasable paint
Photoerasable paint and method for using photoerasable paint
