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<p>[QUOTE=&quot;desertgem, post: 796592, member: 15199&quot;]Ahh, back to advanced science!</p><p><br /></p><p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000">The colors we see for gold and copper are not simple to explain as just % of the metals. They only have their color on the surface and in energetic light ( photons source). When gold is added to glass, the color is red ( &quot;Ruby glass&quot;).&nbsp; I would agree with Doug that the red color does obviously exist on some gold coins, but I believe that gold is still a noble metal and is uncombined with any other metallic atom in the coin. Reflections from electron cloud surface tends to produce the reflective addition and can only be separated by using gold so thin it is transparent to a degree. Then the color ( since it is too thin for an electron cloud reflection) tends to be blue green.</span></p> <p style="text-align: left"><span style="color: #000000">&nbsp;</span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p><p><a href="http://books.google.com/books?id=-fNJZ0xmTFIC&amp;pg=PT272&amp;lpg=PT272&amp;dq=gold+color+quantum+theory&amp;source=bl&amp;ots=rXpDySf5RF&amp;sig=GT0btaT5X-qMMa20X4T5FFCuZOY&amp;hl=en&amp;ei=-fRdS7GeHoGKsgO93YmPAw&amp;sa=X&amp;oi=book_result&amp;ct=result&amp;resnum=7&amp;ved=0CCQQ6AEwBg#v=onepage&amp;q=gold%20color%20quantum%20theory&amp;f=false" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://books.google.com/books?id=-fNJZ0xmTFIC&amp;pg=PT272&amp;lpg=PT272&amp;dq=gold+color+quantum+theory&amp;source=bl&amp;ots=rXpDySf5RF&amp;sig=GT0btaT5X-qMMa20X4T5FFCuZOY&amp;hl=en&amp;ei=-fRdS7GeHoGKsgO93YmPAw&amp;sa=X&amp;oi=book_result&amp;ct=result&amp;resnum=7&amp;ved=0CCQQ6AEwBg#v=onepage&amp;q=gold%20color%20quantum%20theory&amp;f=false" rel="nofollow">http://books.google.com/books?id=-fNJZ0xmTFIC&amp;pg=PT272&amp;lpg=PT272&amp;dq=gold+color+quantum+theory&amp;source=bl&amp;ots=rXpDySf5RF&amp;sig=GT0btaT5X-qMMa20X4T5FFCuZOY&amp;hl=en&amp;ei=-fRdS7GeHoGKsgO93YmPAw&amp;sa=X&amp;oi=book_result&amp;ct=result&amp;resnum=7&amp;ved=0CCQQ6AEwBg#v=onepage&amp;q=gold color quantum theory&amp;f=false</a></p><p><br /></p><p>Since the color of gold depends so much on the energy of photons striking the surface, it might be feasible ( speculation) that some chemical material during processing might become annealed to the surface and due to its chemistry block some photons of a certain energy level and thus produce the red effect (/speculation).</p><p><br /></p><p>This is an interesting area, but research on some of the papers on color of metals and quantum effects can clear some of the thoughts. IMO. </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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