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<p>[QUOTE=&quot;RickieB, post: 805593, member: 2486&quot;]Well we first need to determine this;</p><p><br /></p><p>Paper used for production of US Currency is a special formulation of cotton and linen. If I am not mistaken it is a factor of 75% and 25% of the above.</p><p>Acid levels/concentration is the leading cause for the slow degradation of non archival papers like news paper.</p><p>On the other hand Archival paper is made from a slightly alkaline paper with a pH of 7 (neutral or slightly above 7 which becomes basic). Has any one conducted a litmus test on the non inked surfaces of US Paper Currency?</p><p><br /></p><p>The answer to this question is simply put as the content of acid in our currency. Oxidation can occur when moisture and heat are present in the same environment as the currency..this usually shows itself as foxing (light to dark yellow brown stains) this is why the Relative Humidity is so important in storage of Historical Documents and currency for that fact.</p><p><br /></p><p><br /></p><p>Two primary factors contribute to the degradation of conventional paper.</p><p><br /></p><p>1.First is lignin, a component of the cell walls in plants. Lignin will turn yellow as it is exposed to heat, causing yellowing paper. </p><p><br /></p><p>2. Acid makes the paper more fragile, thin, and brittle. Newspapers provide perhaps the best example of this. </p><p><br /></p><p>So take a small sampling of non inked paper from a $1 note dissolve or work the fibers till they are saturated with a pH7 distilled water..then the litmus test when it is saturated state...there your answer will lie.</p><p><br /></p><p>The chemical make up of the paper used for US&nbsp; notes is not revealed to the General Public, if that were the case, we would all be making it.</p><p><br /></p><p>Here is a nice link that can explain it a little better if you like.</p><p><a href="http://www.cmu.edu/acrc/hydrolysis_&amp;_oxidation.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.cmu.edu/acrc/hydrolysis_&amp;_oxidation.htm" rel="nofollow">http://www.cmu.edu/acrc/hydrolysis_&amp;_oxidation.htm</a></p><p><br /></p><p>Does this answer the question if they need to breath or not..well no, it address what happens where they breathe...</p><p><br /></p><p>RickieB[/QUOTE]</p><p><br /></p>

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