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<p>[QUOTE=&quot;desertgem, post: 746629, member: 15199&quot;]Corrosion is an endpoint. A normal progression could be:&nbsp; fresh minted--&gt;patina--&gt;toned--&gt;corrosion visible--&gt; corrosion deep--&gt; back to nature.</p><p><br /></p><p>Shortest time is between fresh minted and patina. </p><p><br /></p><p>Time will vary between stages due to many factors, primarily water and environmental chemicals exposure.</p><p><br /></p><p>Looking at pocket change I can see corrosion on many cents that are very recent.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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