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<p>[QUOTE=&quot;-jeffB, post: 3254097, member: 27832&quot;]That seems testable enough, but I&#039;m unclear on exactly what to do.</p><p><br /></p><p>1) How should I clean the coin&#039;s surface? Shall I sand it? I&#039;m assuming I just want to ensure that it&#039;s freshly-exposed copper.</p><p><br /></p><p>2) Don&#039;t I have to do something odd to make it turn blue? I expected that I&#039;d get brown, and might have to wait a while for that.</p><p><br /></p><p>3) When it turns blue, how should I &quot;change it back to brown&quot;?</p><p><br /></p><p>I want to try this, but I think maybe I&#039;m misunderstanding you...?[/QUOTE]</p><p><br /></p>

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