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<p>[QUOTE=&quot;Detecto92, post: 1495292, member: 75105&quot;][ATTACH]190956.vB[/ATTACH]</p><p><br /></p><p>As crazy as it sounds...</p><p><br /></p><p><br /></p><p>The green and yellow makes it look like it has been in contact with some sort of acid. I&#039;ve never seen 90% silver turn green like that. The yellow and the green looks like it had nitric acid on it before. I&#039;ve seen similar results on tested silver.</p><p><br /></p><p>I highly doubt verdicare would do much help, it may take off some of the green, but the yellow is a whole &#039;nother story.</p><p><br /></p><p>Any kind of acidic jewelry cleaner may react with the &quot;green and yellow&quot; and cause further damage. I would not trust that stuff.</p><p><br /></p><p>Polishing it will make it looked &quot;whizzed&quot;.</p><p><br /></p><p>Your best bet would be a rock tumbler. </p><p><br /></p><p>The tumbling process will strip most of the tarnishing off, but it won&#039;t make it look bright like it will if you polish it.</p><p><br /></p><p>Call me a fool, but this is the best way. Your either going to be stuck with a ugly half dollar, or a cleaned half dollar. As ugly as that is, I would go for the latter. </p><p><br /></p><p>That green stuff is gonna mix with the oxygen in the air, and will most likely get worse. A cleaned coin can re-tone over time and look much better than the current situation.[/QUOTE]</p><p><br /></p>

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