I'd given a few RC prints to colleagues in my office and they had put the loose prints up around their desks. Now I find that they all have started to fade and turn yellow in the highlights They are hardly a year old. In over 14 years of printing this is the first time I see this happen and wonder why. I have numerous RC prints - new and old - pinned up at various places at home and they all look fine, so I doubt it's my processing. The office is a typical IT/Engineering office with laptops, fluorescent lighting etc. Maybe in the evening the cleaners spray around with some chemicals; I don't know. Recently I've placed a loose FB print on my desk...just to see how that one fares. Any ideas or experiences?