It looks like all oxidation which happens to copper over time. I don't think acetone will help. Maybe some others with more knowledge can chime in on this one
Soak it in a clear mineral oil bath. Use a pre-moistened Q-swab to lightly lift off any excess debris after soaking it for 1 month. Repeat. Do not rub the swab against the coin.
Change the mineral oil every three months. A capped nickel or quarter plastic tube works great. This process wll take over one year.
The mineral oil will slightly darken the FE cent. That is the only negative outcome.
Olive oil is marginally acceptable as a substitute for mineral oil.
If you change it at least once a month then you are ok with it since it will not yet turn rancid. If you wait more than 1 plus month to change the olive oil then it could turn rancid on you and ruin the coin.
One other thing. To dry the coin, squeeze dry it by using very soft paper tissue wrapped around the coin and squeeze hard using the finger and thumb (do not rub). Repeat using a slightly different and dry area of the tissue paper.
Looks like verdigris, not PVC. Blue Ribbon conditioner may help a bit, but if the verdigris is removed, the pitted surface underneath will look at least as bad, likely worse.
thearms
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Change the mineral oil every three months. A capped nickel or quarter plastic tube works great. This process wll take over one year.
The mineral oil will slightly darken the FE cent. That is the only negative outcome.
You could let it soak in olive oil for a month or so if you intend to put it in an album, but I don't think it will help retail value much.
Jim
If you change it at least once a month then you are ok with it since it will not yet turn rancid. If you wait more than 1 plus month to change the olive oil then it could turn rancid on you and ruin the coin.
will look at least as bad, likely worse.
Acetone won't hurt, but likely won't help.
(Taps in background, mournfully)