Doug, Believe it or not I have collected dice for 65 years! My Dad would bring them home from his club when I was 8 years old. When I counted them about 20 years ago I had 14,000 pairs. Casino, drug store, gaming, you name it. My really rare stuff was constantly deteriorating. Over the years I tried everything, when I lived in Peoria I even bought a small freezer for my garage. Nothing works, eventually you will open your sealed bag and find dust. The old nitrates are just unstable. Sorry, Jim