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<p>[QUOTE=&quot;19Lyds, post: 1948694, member: 15929&quot;]Right.</p><p><br /></p><p>Gas can &quot;diffuse&quot; in and out of a slab.</p><p><br /></p><p>However, that&#039;s a rather broad definition in that the slab pieces &quot;interlock&quot; within each other which leaves gas &quot;diffusion&quot; at the absolute minimum.</p><p><br /></p><p>Coin can be subject to other extremes which can affect their surfaces such as heat which in an of itself &quot;might&quot; cause a certain level of &quot;breathing&quot; but still at an absolute minimum.</p><p><br /></p><p>Maybe I&#039;ll take on of my PCGS Silver Eagle slabs and store it in a box of strike anywhere matches in the second floor of my garage to see how the coin is affected by such an extreme environment.</p><p><br /></p><p>As for the OP, the spotting which can be observed is more than likely residual rise contaminants on the surface of the coin prior to it being slabbed. A photograph would be needed.[/QUOTE]</p><p><br /></p>

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