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<p>[QUOTE=&quot;desertgem, post: 2275244, member: 15199&quot;]Even though the holder is &quot;sealed&quot;, there is a leak ( not unusual) that is allowing the change. Silver-&gt;gray&gt;black (corrosion damage) on copper is usually due to Copper(II) and red colored ones by Copper(I) ions, along with air ( and the moisture therein). They made it 6 years to this point, but if they continue to be exposed environmentally, the process will continue. The process itself should slow down, but the effects will be accumulative. Toning is just an acceptable ( by many) level of chemical corrosion, and eventually damage levels will occur if continued.[/QUOTE]</p><p><br /></p>

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