Is This Verdigris, Should I Dip In Acetone?

That could happen. As far as a cleaned coin I'm not sure if a TPG would detail this. Interesting question.

I'm not sure that's verdigris,looks sticky like gum or grease.
John1

Battery Acid will work but will also completely ruin the coin.
Just try the Acetone. Nothing to loose. Might be something else on that coin so again, just try.

Yep, I'll start with the acetone, and if I get really frustrated, will consider the battery acid ;-)

Okay thanks everyone. One last question. The only reason I was worried about the coin looking cleaned, if the toning is different, was whether the coin isn't treated as "cleaned" if you have someone professional restore it. Again, this coin isn't worth the trouble, as it's not that expensive. But generally speaking do you avoid the 'this coin is cleaned!" problem if a professional "restores" it, or is it the same problem if the remaining toning makes clear that something was there and now it's gone?

A professional will refuse to conserve a coin for the same reasons we would use to argue against it - the resulting coin will look obviously cleaned. Out here in the forum, where the business isn't on the line, we can look farther out for solutions and candidates for conservation in the interest of preserving whatever the best is that's left in a coin. The arguments for/against are no different.

Verdigris isn't always dry, and PVC plasticizer reactions tend to be milky rather than green on copper. So by all means get it into acetone to start - every coin, always, in my opinion - but expect it to warrant more specific attention to arrest the verdigris. If it's just PVC, by the time it looks like this there's metal missing underneath and although it's anecdotal I've yet to see a copper coin that badly eaten by it. The stuff likes the taste of silver better.

At this distance in time, I think any chemical problems you might have had with your storage methods would have shown itself. You should be fine.