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<p>[QUOTE=&quot;Circus, post: 1758890, member: 51195&quot;]I would suggest you order this book and read about the authors experiments on toning for the coin magazines. As been said depending on the out gassing of say ammonia in a baggie with coins. It can happen in hours. It covers discussions about restoration(cleaning) of coins and toning removing toning and putting toning on coins.</p><p><a href="http://s35.photobucket.com/user/ptsideshow/media/Coins/IMG203.jpg.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://s35.photobucket.com/user/ptsideshow/media/Coins/IMG203.jpg.html" rel="nofollow"><img src="http://i35.photobucket.com/albums/d200/ptsideshow/Coins/IMG203.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></a></p><p>plus look into patina Metal working and craft term, that is what the coin hobby calls toning. There are thousands of formula&#039;s to produce patina&#039;s on metals. Some are safe some are toxic to humans and other life forms.[/QUOTE]</p><p><br /></p>

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