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<p>[QUOTE=&quot;cwart, post: 578919, member: 18487&quot;]I&#039;m not sure what causes the exact colors to appear, but I do know that they come from chemicals and gases in the environments around the coins.&nbsp; Coins kept in the cardboard holder books will tone from the acids in the cardboard holding them...&nbsp; Hopefully thats a starting point for what you are looking for. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>And for the more experienced among feel free to fix what I didn&#039;t quite get right.... <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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