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<p>[QUOTE=&quot;John Burgess, post: 7985517, member: 105098&quot;]Kraft paper envelopes and manilla envelopes will rapidly tone coins if left in them for periods of time. Kraft paper is on the brown side of yellow, manilla is on you orange side of yellow, but either way the chemical process to make the paper leaves acid and sulfur behind that will tone the coins relatively quickly.</p><p><br /></p><p>That said where your worst spots developed, you can see hint of it in the original picture, I believe the coin was treated/cleaned to remove toning and leaving it in the envelope just made it come right back.[/QUOTE]</p><p><br /></p>

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