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<p>[QUOTE=&quot;physics-fan3.14, post: 2235606, member: 19165&quot;]Doug, please read and think about what I wrote. The copper is uniformly distributed over the entire surface, 1000 atoms deep (and indeed, throughout the entire volume of the coin). The impurities aren&#039;t &quot;drawn&quot; to the surface (as you describe in a scientifically-dubious post) - they are already there, as a function of the alloying process. You can&#039;t divide it and say this 25% is copper and this isn&#039;t - there is a (more-or-less homogeneous) mix of copper compounds and gold uniformly spread throughout the surface of the gold. The copper molecules are reacting, the gold molecules aren&#039;t. </p><p><br /></p><p>If it is the gold itself forming compounds, please provide a scientific explanation of the compounds being formed. Gold is incredibly non-reactive, and won&#039;t easily form compounds under normal circumstances.</p><p><br /></p><p>I can&#039;t recall seeing any .999 gold coins which have toned. Please provide the promised pictures of them. (Not being familiar with these, I would surmise that the toning is very slight - and would still argue that it is the copper impurities which are reacting, not the gold itself).[/QUOTE]</p><p><br /></p>

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