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I see a couple people making the same wrong assumption. PVC is not a reaction with the coin. It's a breakdown of the plastic leaving an oily residue on the coin. Verdigris (or tarnish/toning) is a reaction with the coin.
No wrong assumption, just noting the obvious.
See this:
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And that is where I really get curious. Almost any reaction with anything with coins is usually solid, not a mush or pssty substance. You really should check out the area you keep your coins. There is something wrong.
If you notice it is stated "Almost any reaction" HOWEVER,
Again, no one is really talking about PVC at all. We are discussing a DANSCO ALBUM. There is no PVC in a Dansco Album. Not in the material of the Album and not in the slides.