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<p>[QUOTE=&quot;desertgem, post: 1816526, member: 15199&quot;]This has come up several times, and most are looking at this from the &quot;classical chemistry&quot; mode rather than from the Quantum chemistry mode which does more to explain. Classic chemistry can not tell us why gold, copper , silver can have color as metals. The Bohr atom/electron shell based chemistry can not explain the quantum aspects&nbsp; of the metallic bond (not in classical chemistry). Only the skin of these metals show color according to current papers.</p><p><br /></p><p><a href="http://en.wikipedia.org/wiki/Metallic_bonding" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://en.wikipedia.org/wiki/Metallic_bonding" rel="nofollow">http://en.wikipedia.org/wiki/Metallic_bonding</a></p><p><br /></p><p>And below article does explain metal color this level&nbsp; and why the color of gold, silver, and copper can vary in solutions ( alloys) with other metals. The &#039;Skin&#039; of the metal surface can ( in case of copper and silver) can react with surface contaminants, but the natural color of the metal is created by the quantum action beneath the surface layer.</p><p><br /></p><p><a href="http://www.webexhibits.org/causesofcolor/9.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.webexhibits.org/causesofcolor/9.html" rel="nofollow">http://www.webexhibits.org/causesofcolor/9.html</a></p><p><br /></p><p>Also other supportive articles for those who do understand quantum effects and color some.</p><p><br /></p><p><a href="http://www.basqueresearch.com/berria_irakurri.asp?Berri_Kod=4222&amp;hizk=I#.UofQVOI7ze4" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.basqueresearch.com/berria_irakurri.asp?Berri_Kod=4222&amp;hizk=I#.UofQVOI7ze4" rel="nofollow">http://www.basqueresearch.com/berria_irakurri.asp?Berri_Kod=4222&amp;hizk=I#.UofQVOI7ze4</a></p><p><br /></p><p><a href="http://www.fourmilab.ch/documents/golden_glow/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.fourmilab.ch/documents/golden_glow/" rel="nofollow">http://www.fourmilab.ch/documents/golden_glow/</a></p><p><br /></p><p>These explain &#039;ruby-red&#039; appearance of nanoclustered gold atoms in small loci.</p><p><br /></p><p><a href="http://www.ncbi.nlm.nih.gov/pubmed/22720781" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.ncbi.nlm.nih.gov/pubmed/22720781" rel="nofollow">http://www.ncbi.nlm.nih.gov/pubmed/22720781</a></p><p><br /></p><p><a href="http://www.nano.gov/nanotech-101/special" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.nano.gov/nanotech-101/special" rel="nofollow">http://www.nano.gov/nanotech-101/special</a></p><p><br /></p><p>There are many others that are written in a deeper math foundation, but these should indicate that a .9999 or better gold mass can exhibit other coloration than &#039;gold&#039;. but that doesn&#039;t mean it is from a contaminant or other material, but possible from underlying metallic bonding or gold nanoparticle localization . Good Reading <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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