[behindthemask]

I've seen this happen more with packaging then figures itself. I've bought MOC figures off ebay and got them cheap because the packaging was all yellowed and card was bent, upon opening the figure and inspecting it was fine. Direct sunlight eats anything from artwork, pictures, painting and yes toys. I used to collect Hockey Cards and had some rare autographs turn to shit because the signaure got slightly faded. Best thing is to keep sunlight out of the direction of your collectables. For me that means, majority of my collection is in a display case, protected by glass, and the windows around it have blind and curtains.