Fading due to ultra violet (UV) light in natural daylight is a common occurrence and, as a picture framer, it something I come across regularly when undertaking reframing jobs. This particular print is an extreme example. The print is about 25 yeas old and as can be seen in the photograph has faded almost to nothing over the years. I originally thought it was a moody monochrome print but it turns out it was originally a colour print. UV glass would have reduced the fading considerably but I suspect there was a fault with the original processing of the print to see this much fading.