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<p>[QUOTE=&quot;desertgem, post: 4564476, member: 15199&quot;]One must match the chemical and concentration with the object composition, otherwise damage will occur. </p><p><br /></p><p>It is actually safer today than in the past when cyanide solutions were used on coins, especially silver ones. Some amateur gold prospectors still use it is a refining process.</p><p><br /></p><p>Numismatist Saltus is the prime example :&nbsp; <a href="http://numismatics.org/authority/saltus" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://numismatics.org/authority/saltus" rel="nofollow">http://numismatics.org/authority/saltus</a>[/QUOTE]</p><p><br /></p>

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