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<p>[QUOTE=&quot;Blissskr, post: 2857322, member: 34882&quot;]I assume they used a temperature hot enough to readily melt both the gold and copper which have very close melting points and didn&#039;t do anything to actually oxidize the copper out. Though I do suppose it&#039;s likely why the &#039;coin&#039; bars are said to have a tarnished appearance as the copper may have floated a bit on the surface.[/QUOTE]</p><p><br /></p>

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