Card Identification Forum

 I have the full 27 card insert set from Topps Finest 93-94 basketball. I've stored the cards in Ultra-Pro 9-card sleeves. Almost all the cards have lost their color and look like reverse negatives. Has anyone else experienced this or have any clue why this is happening? The cards have not been exposed to light, smoke or anything that I can think of to cause this. I've seen some listed on eBay and they apear to have the same defect. What's up with that?

 Was pretty common with the cards in that set-kind of take on a greenish tinge to them. When I chased this set, the ones that came from humid climates seemed to have it worse.  I have seen it in both "loose" and stabbed cards.