Adam & Gary, that's definitely in play and makes sense. My only thought would be that we would see varying degrees of brown, no? The backs are just about identical to each other and yet they have been stored in different conditions for the past 40 years -- Al's in a cardboard box and mine in a metal box that was wrapped in cellophane.
That may not have anything to do it with though. It may just be a matter of time, no matter what the conditions are. It's probably the most logical theory so far though, considering no one has noticed them until now. I think it has to be that the cards were printed on a stock that wasn't treated or had a different trait that would allow them to brown over time, not that the cards were from a smoker's home. If it were an outside agent then more than one card would have been affected.
Arthur
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