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<p>[QUOTE=&quot;kanga, post: 280826, member: 9270&quot;]The mint bags <u>generally</u> only resulted in toning on one side, like coin rolls.</p><p>Don&#039;t know about the sun.</p><p>Those old brown coin envelopes were REAL nasty. Leave a coin in too long and you ended up with a black disk. I messed up a couple nice 1000 yen Japanese coins from the 1964 olympics that way.</p><p>And of course the old albums. Many of my UNC 1941-1964 quarters suffer from some unsightly toning because of album storage.</p><p>&nbsp;</p><p>I&#039;d be interested to know what the TPGs use as keys for detecting AT.[/QUOTE]</p><p><br /></p>

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