I peeled a 2013 Casascius silver today and was horrified when the paper containing the private key started to separate. I managed to get it off and found what appeared to be adhesive on the silver under the paper.
Very worrisome and I am considering peeling the rest of my collection.
I've peeled the 2013 1
BTC Silver/Gilt (already in thread) and a 2013 0.5
BTC Brass that will be added to this thread with the next update and have not noticed the degree of adhesive you are finding in the private key recess on either coin. I actually happened to be right around the peeled coins when I saw you posted here and have taken these current pictures for you.
Things I can completely throw a guess at would be:
Humidity or heat causing some of the adhesive to run down underneath the insert
An application error by Mike Caldwell? Pretty monotonous applying holograms for hours and hours or even days on end. Of all the coins peeled and shown here so far this might be one of the first to have shown this sort of error application made by the creator.
There just doesn't seem to be any pattern or clue to the splotching pattern it ended up leaving.. this is definitely mind boggling because that adhesive should not be there at all. I'm interested in seeing the private key paper if you'd be willing to share with me even in private nubbins. Completely up to you but that is my main concern and why I created this thread and project.
Regardless of everything the paper splitting in two and being extremely thin should scare everybody. Trying to think of ways for if the thin layer that held the ink remained on the coin face down still... what do you even do? Should always have a scalpel or sharp/fine razor nearby when peeling, also if it starts to tear like that I'd personally try from the other side of the holo and hope that that side of the paper insert remained as one.
Glad you were able to document and share this peel with us nubbins.
Put an X on the board for paper inserts. Engraving looking better and better after every scary peel.
**Edited post, didn't like original reply.