Dr. Yang, Cheng-Fu, professor from Department of Chemical and Materials Engineering at National University of Kaohsiung applies “Long decay life phosphors” to three layered acrylic with hollowed-out graphics or characters. After the phosphor powders absorb sunlight or other visible light, the radiation can last up to 8 hours in a dark place. It can be applied to billboards or traffic signs; it can also be added into paint to draw road dividers in order to increase traffic safety.