METHOD OF INCREASING THE USEFUL LIFE OF A SIGN OR DISPLAY

摘要

A method of improving the useful life of a sign or display is provided. In this method, a sign or display comprising two images and an intervening opaque layer is provided. When the quality of the first of the images to be shown has degraded to an unacceptable degree, the sign or display is reversed to show the second image, which has been at least partially protected from environmental degradation by the intervening opaque layer.