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<p>[QUOTE=&quot;mrjason71, post: 2990373, member: 90347&quot;]Hello</p><p><br /></p><p>I wanted to start a discussion about conserving bronze/copper coins with black spots. I see these mostly referred to as &quot;carbon spots&quot; but from what I understand, they are really sulfur spots. I actually don&#039;t care much what they are or how they form (except in regards to preventing them); I would love to have a thread devoted to removing them--a place where any who have attempted to remove them share their experience.</p><p><br /></p><p>I have seen them grow and multiply. A standard way of conserving them would be really helpful and I really am astonished that no common approach seems to exist. I&#039;ve spent many hours reading up on this and mostly I just see a lot of people who have thrown their hands up in the air and given up. I believe NCS will remove them for a fee. I would love to hear how people think they remove them.</p><p><br /></p><p>The only success I have had is via mechanical means--literally scraping them away. Obviously that is a terrible way of going about it. Is there no acid or other substance that can dissolve these away (without eating away the good parts of the coin)? The EZ-est&#039;s of the world cannot touch them.</p><p><br /></p><p>Any thoughts are appreciated.</p><p><br /></p><p>Thanks.[/QUOTE]</p><p><br /></p>

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