Articles are provided which have fluorescent properties and which are suitable for use in making retroreflective articles such as safety and informational signage. The articles have at least two film layers, each film layer including a colorant dye. The multiple film layer sheeting exhibits excellent...http://www.google.es/patents/US7618710?utm_source=gb-gplus-sharePatente US7618710 - Fluorescent articles having multiple film layers
