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<p>[QUOTE=&quot;GDJMSP, post: 346936, member: 112&quot;]It&#039;s not cellophane, it&#039;s pliofilm. But as I said none of them are airtight and they never have been. There is no such thing as an airtight coin holder - none have ever been made. Plastic in all forms is permeable.</p><p><br /></p><p>The fact that your coins have not noticeably toned does not mean anything other than they have been properly stored over the years. </p><p><br /></p><p>But, if you were to remove the coins and place them side by side with freshly struck coins you would in fact see that they have toned, albeit slightly. This is something that very few people ever take into consideration. Toning on coins is inevitable, it begins the instant the coins are struck.[/QUOTE]</p><p><br /></p>

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