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<p>[QUOTE=&quot;kaparthy, post: 25123, member: 57463&quot;]Actually, except for pure gold coins, that is not exactly true.&nbsp; Alloys are not compounds. Gold and copper do not make Gold cuprite or Copper aurite or whatever.&nbsp; It is more like salad dressing where all the particles are in suspension.&nbsp; So, you can get spots of toning (corrosion, etc.) on a gold coin.&nbsp; Generally, ancient gold coins were not purposely alloyed, but the techniques for refining were limiting.</p><p><br /></p><p>(Since we are splitting hairs here -- or at least I am -- you have to define &quot;gold&quot; when speaking of ancients.&nbsp; Electrum (gold plus silver and sometimes plus copper, etc.) could still be called &quot;gold&quot; today.)</p><p><br /></p><p>All of that does not really contradict the general truth that a gold coin maintains its luster over time and hardly tones or corrodes at all.[/QUOTE]</p><p><br /></p>

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