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<p>[QUOTE=&quot;medoraman, post: 981167, member: 26302&quot;]I agree that gold &quot;darkens&quot;, that is the best description I can think of. I have tried searching, anyone ever hear of analysis of the toned surfaces of gold? I would be curious if it was an oxide or sulfide or what. That would help in preservation I would imagine. All of the sites I looked at said gold toning is due to impurities in the metal, specifically silver or copper.[/QUOTE]</p><p><br /></p>

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