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<p>[QUOTE=&quot;rzage, post: 1551587, member: 14070&quot;]Like they said , it&#039;s a chemical reaction between the sulfides in the albums the air and the metals in the coin . As Greg said there are no completely airtight containers short of creating a vacuum . Even in the best holders air will get in , if you want the toning to slow down , use some sillica gel canisters to absorb the moisture from the air .[/QUOTE]</p><p><br /></p>

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