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<p>[QUOTE=&quot;GDJMSP, post: 2098806, member: 112&quot;]I would never use ammonia on silver coins. Ammonia will turn silver black. This is well known.</p><p><br /></p><p><a href="http://www.crscientific.com/article-silver.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.crscientific.com/article-silver.html" rel="nofollow">http://www.crscientific.com/article-silver.html</a>&nbsp; </p><p><br /></p><p>Please look at the left hand column on that page - </p><p><br /></p><p><i>Silver compounds must be kept away from:</i></p><p><i><br /></i></p><p><i>• Acetylene or acetylides&nbsp; (e.g., calcium carbide)</i></p><p><i><br /></i></p><p><i>• Ammonia or ammonium salts (prolonged contact)</i></p><p><i><br /></i></p><p><i>• Oxalic acid or oxalates</i>[/QUOTE]</p><p><br /></p>

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