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<p>[QUOTE=&quot;rlm&#039;s cents, post: 1315942, member: 7957&quot;]Although Doug will disagree, from what I have been able to make out, it is not that the alloy CAUSES the color change.&nbsp; It is merely that the alloy reacts differently with its surroundings.&nbsp; So if the atmosphere is right for a coin to turn blue, the alloy may turn darker or may not turn at all.&nbsp; Either way, the alloy becomes pronounced.[/QUOTE]</p><p><br /></p>

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