The company that owned the process also made postcards and some larger souvenir type items. I have a few and even the big ones are still Ok.
So far the Sportflics and another mid 90's 3d set are also fine.
Most of the Kelloggs I have are ok too.
But some licensed 3d postcards I have came very curled, and probably can't be straightened.
I believe the problem is the plastic shrinking a bit while the paper on the back doesn't. Humidity would make that worse since the paper might expand. Some plastics shrink as the plasticizer dries out of them. Sunlight and heat would make that worse too, so 3d stuff stored since new would probably be decent, ones trucked to a flea market for a couple years probably not.
The late 70's set I got through the mail came in four card panels. They didn't curl, but did separate a bit. I'll have to check and see if the ones from inside the boxes are different.
Steve B
|