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<p>[QUOTE=&quot;desertgem, post: 716222, member: 15199&quot;]Most likely it is a sulfur compound reacting with both the silver and the 10% copper ( I assume tat is the other 10%). A &quot;Dip&quot; might not remove all, and would not be advised. To preserve, I would rinse with acetone ( or if that seems a little too strong for you, 90% isopropyl alcohol is available at Walmart and other pharmacy areas) and then after air drying, put into the storage holder. The continuation will depend on the environmental factors of humidity and gases where stored. The airtite holder will help a lot, but is not air or humidity tight. If it can be replaced inexpensively, I would do that anyway if the spots bothers.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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