This problem coin came to me by a friend that didn't want it. The reverse has scratches but I'm wondering about the dark area over the NT in CENT. (Environmental damage) Should I try Acetone? What do you think it is? It almost looks burnt. Thanks Bruce
Two things I can say; Acetone will not touch that. It is good for PVC and other organics. See http://www.cointalk.com/forum/t47934/ and ask yourself if you really want to do anything.
The only way to get that off that I can think of might kill the coin but I will say it anyway. Use something like vinegar and baking soda to clean it and turn it into a nasty unnatural pinkish orange color than use dellars darkener to retone it. I am not sure if that would work but it is the only thing that I can think of. Let me warn you though that would destroy the coins value but it may remove the black "burnt" spot. I would not do that unless you are really bored and want that spot removed. Let me repeat myself, I would not recommend doing that.