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<p>[QUOTE=&quot;Michael K, post: 3925044, member: 78298&quot;]The coins can tone even in a proof set. Gases can get trapped in there and tone the metal, or, perhaps it&#039;s not 100% air tight.</p><p>I have an older proof set (30 yrs) and one of the coins has toned, but the toning probably started 15-20 years ago.</p><p>As for the quarters, (this is an old thread) I am going to assume it is environmental toning. Which usually means the coin is just &quot;rusted&quot; darker. Often times these coins are recovered from the ground via metal detecting and reintroduced to circulation.</p><p>The air, water, soil, pollutants will react with the metal and turn them very dark.</p><p>A missing clad layer is very rare, quite noticeable and has an attractive bright copper color on one side. And it will weigh less.</p><p>[ATTACH=full]1034621[/ATTACH][/QUOTE]</p><p><br /></p>

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