I haven't heard of anyway to stop the crystallization. I believe that the plastics used then were a petroleum base, so I wonder if something like mineral oil would slow it down any. Just a thought. A little story about that crystallization. We were at a flea market once in Reno and a lady had some dice she said had "gold" in them. Of course, it wasn't gold, they were just crystallizing. We didn't want to burst her bubble, but afraid we did. She also had a print--one of those on cardboard with texture to look like brush strokes. Claimed it was an "original" oil painting. Needless to say, we didn't buy anything from her!
Jodi CH0009-A
Casino Collectibles
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