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<p>[QUOTE=&quot;desertgem, post: 2235777, member: 15199&quot;]Tannin and tannic acid is low is mahogany and high in oak. It does react on metals, especially iron and copper. It is common in tea and coffee, and gives much of the coloration. If the cabinet is home constructed and the wood is covered with acrylic finish rather than oil, wax, etc. The coin metal would probably safe. I would never use flocking/sheared velvet or felt, as the commercial manufacture of these can contain chemical contaminants, esp. if&nbsp; from the far east. I also would use Kointain holders for coins in a cabinet even though they are some of the most difficult to work with, they work very well for coins to be handle.</p><p><br /></p><p><br /></p><p><a href="http://www.brooklyngallery.com/cgi-bin/commerce.exe?preadd=action&amp;key=0140-KTH195" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.brooklyngallery.com/cgi-bin/commerce.exe?preadd=action&amp;key=0140-KTH195" rel="nofollow">http://www.brooklyngallery.com/cgi-bin/commerce.exe?preadd=action&amp;key=0140-KTH195</a>[/QUOTE]</p><p><br /></p>

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