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<p>[QUOTE=&quot;Ken Dorney, post: 2467065, member: 76086&quot;]Looks like a Judaean, which are prone to BD.&nbsp; One has to remove it manually.&nbsp; I use a wooden toothpick so as not to scratch the surface of the coin itself.&nbsp; Scrape it out until you get to metal.&nbsp; Use distilled water to rinse it off, then scrape again.&nbsp; Rinse again, etc.&nbsp; Do it as many times as you can guess that it is gone (some people heat treat the coin afterwards, just in a low heat oven).&nbsp; When done, check it at least weekly for maybe a year.&nbsp; Thats the basic explanation.&nbsp; I know there are those who use chemicals and other methods, but one has to be careful about it lest you destroy the coin.[/QUOTE]</p><p><br /></p>

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