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<p>[QUOTE=&quot;John Burgess, post: 4934102, member: 105098&quot;]if this is how it was stored for 3 months,this is not a manila envelope, its cardboard.[ATTACH=full]1186078[/ATTACH]</p><p>Specifically Kraft paper cardboard, Kraft paper is made by using the &quot;Kraft Process&quot; and it involves wood chips being cooked in a sodium sulfide and sodium hydroxide mix to break down the lignin and separate it from the cellulose. the remnants of said chemicals of this process are in the brown kraft paper cardboard envelope or any other cardboard of this color really.</p><p><br /></p><p>coin 2x2s don&#039;t use this material. it is a cardboard, but not that kraft process.</p><p><br /></p><p>Manila envelopes are more paperlike and yellow to orange.</p><p>Kraft paper cardboard is this brown color, just like kraft paper color is or most cardboard boxes.</p><p>Cardboard 2x2s and coin storage is more of a fibrous cardboard and &quot;grey&quot; color which is less chemically treated. they use this grey cardboard also for shoeboxes and other items, because it&#039;s less harsh for longer term storage to the items inside.</p><p><br /></p><p>sitting in there for months absolutely will cause it to color up rapidly.</p><p>If it was me, I&#039;d let it run it&#039;s course and take pictures of it every 3 months and turn it into an experiment and make lemonade out of a lemon. this might produce some interesting color along the way....</p><p>or stop it right where it is and get it into something less reactive. all it&#039;s done is color up what was already existing on the surface making it more noticeable as it tones.[/QUOTE]</p><p><br /></p>

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