91É«ÇéƬ

Another colourful cellphone for the fashion-conscious from R-Design of
Helsinki (WO 98/56221). The phone is moulded from plastic mixed with a dye that
is sensitive to ultraviolet light. The surface is printed with letters, numbers
and patterns, using a UV-sensitive paint. So the phone and the messages printed
on it change colour when you take it outdoors, depending on how sunny it is.