I'm sure everyone here might know this, maybe I'm preaching to the choir, but watch out for PVC coin flips. I checked my twin's collection which was sitting in his basement for about 20 years, and the results are in the YT short linked below if anyone wants to see. https://youtube.com/shorts/Oh8305k5uSo?si=qpcTtS4LScUxwxt5 Green ooze stuff... fun fun fun!
Most anything you buy now is advertised as being non-pvc. I thought the industry had mostly gotten away from this years ago.
Good point! Maybe it only affects the collections sitting in basements for 20+ years. I imagine there's probably some less reputable suppliers on Amazon or Temu that might not pass the test, but unsure.
So those coins were luckily all worth face value, I sent them back to the bank except one SBA wide rim that I gently wiped. It will not regain its luster. It's a details coins at this point, but luckily not ultra rare. This was my brother's collection that he got when we were kids, he isn't a collector so he wasn't hurt by it any.
PVC flips are very much available and are seen often on coin supply sites. It does seem though that most are now archival safe. Bruce