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Message:: [QUOTE="Collect89, post: 466037, member: 15445"]coin will probably be ruined Copper coins are ruined more often than they are helped. I believe that there is a high probability that this coin is going to "blow-up" on you. You don't know what it is going to look like underneath that gunk.  You may want to sell it as-is. However, with the obverse gunk, it's probably not worth much to anyone so you may decide to conserve it yourself. I might suggest that you apply warm distilled water & soak for a long-long time. Maybe soak for a day. See what happens. Maybe after the soaking you could pick gently at this surface gunk & see if it is willing to fall off easily. The key word is gently and look at what you are picking under magnification. Cover & soak in Acetone for a long long time. Keep an eye on it and keep the area ventilated.  See what happens. Maybe after this soaking you could pick gently at the surface gunk & see if it is willing to fall off easily. Again, the key word is gently. If you pick & touch the coin with anything to loosen this debris, then view the coin under magnification when you do it. When you are through ruining the coin with these procedures, apply some Blue Ribbon to the coin. Very best regards,collect89 P.S. If the obverse gunk is not lacquer, it might be corrosion from a previous acid cleaning and re-toning.  In this case, if you get under the re-toning, then it is going to look really bad.[/QUOTE]