I recently noticed that many of my older discs (3-4 years and up) have a slightly gold tone to them instead of being silver and clear. I tested some and they seem fine, but I'm worried that the long term effects could damage them (the dreaded "disc rot"). Many of these are from expensive box sets, so I'm naturally very concerned. The shelf they are on is near a window that gets some sun, but I've taken pains to make sure the shelf and the boxes are shaded. I kind of like having the boxes displayed but certainly don't want to risk ruining a collection. Anyone have any similar experiences? Are the discs in danger because they've developed a slight color to them? Any info is appreciated.