Im already trying to clean a silver coin with a black layer on it (both sides) with ammonia/lemon/toothbrush for 3 weeks.. the problem is, the layer keeps on the coin on most of the parts! When I put it in the ammonia, it turned black for the first time, but couldnt rub more off after that day, same problem soaking it in lemon juice.
Do you have any experience with such coins?
Oh by the way its a denarius of Augustus with good detail, only its black!
I wouldn't do anything more to try an clean this coin. From your pictures it has a really nice patina to it. I don't think you would get it to any nicer than what it looks now.
From your description in the first post, the impression was that the Denarius was encased in a black tarnish, which can be cleaned off with a long soak in Distilled Vinegar (White Vinegar).
From your second post with the photos of the obverse and reverse I reckon it is fine as it is.
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