My friend has a coin he bought that was in a holder and has what looks like two rust marks on the coin where the staple was holding it in place. I have no idea how long it would have had to have been there or the staple would be right next to the coin for that bleed. But he uses all of his coins in a regular 2x2 with staples.
If there is rust on the staples, then I think the bigger problem is where the albums or boxes (holding the 2x2s) are being stored. Low humidity and stable temperature are important. If moisture got to the staple, it can get to the coin.
"Thanks to all the response.I have since found a archival quality adhesive in a glue stick called UHU. Acid free non toxic archival quality stated on the package. Just what I was looking for , guess what it dosen't stick to the plastic, flip pops open."
Mr Canada: Where did you find that? Sounds really interesting!
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