Thankfully it was a cheap hole filler. I picked it up with an 1846 for $22. The 1846 was quite dirty but in better shape. After an acetone soak, I put it on top of the plastic flip it came in still wet. The acetone reacted with the plastic and removed the patina in a spot on the reverse and dulled it in a wider area. This is the first time that's happened to me. Needless to say, I won't be doing that again.
The ERI in America is where it stripped the toning. That was a darker area on the coin to start with. So between the acetone, reacting plastic, and whatever was the on the coin, it ended up cleaning the spot.
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