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<p>[QUOTE=&quot;Detecto92, post: 1452350, member: 75105&quot;]1. No. Mylar is not permeable. It&#039;s a plastic film. Same thing used in roasting bags, which don&#039;t leak as well.</p><p>2. Yes. </p><p>3. Because the surface of a proof/ms coin is smoother. A rougher surface from a circulated coin wont allow the print to come in contact fully with the surface. </p><p>4. About one week.[/QUOTE]</p><p><br /></p>

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