I've seen this from time to time and never known what it is. What is this black line on this quarter that I otherwise like a lot? It does not seem to cut into the metal but rather be on the surface? Any remedy?
i did just try acetone. Left it for 20 minutes or so but the line didn't go anywhere. I have found that, if acetone is going to work, it does it in about 2 seconds. Is there any benefit to soaking for a longer time?
I agree that 20 mins seems like it should be plenty of time. It is hard to tell from your pics as they are a bit blurry and taken through the 2x2 window. Is there displaced metal such as from a scratch?
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