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<p>[QUOTE=&quot;RonSanderson, post: 3251767, member: 77413&quot;]My only theory on this is that the crud itself has trapped contaminants, and dissolving the crud frees the contaminants to settle on the surface of the coin. But since you a swirling a coin around in the acetone, even this seems far-fetched. It&#039;s easier to believe there are trapped contaminants held next to the coins surface by the crud, and that cleaning away the crud reveals the results of that. But, I agree that the assertion of a direct reaction between acetone and the copper is very hard to believe.[/QUOTE]</p><p><br /></p>

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