From the U.S. patent office:
? Title: Tire with fluorescent layers Applicant: Michelin, France International application number: WO 2004/050391 Michelin is patenting a tire containing a dye or pigment that fluoresces when exposed to ultraviolet light. The inventors say that shining an ultraviolet light onto the tire reveals the dyed regions and could aid retreading or alignment. In another instance, steel belts within the tire are marked using a fluorescent tape.