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<p>[QUOTE=&quot;SilverSurfer, post: 983291, member: 21603&quot;]As for gold toning, I&#039;m going to say that gold doesn&#039;t tone.&nbsp; But, I do think that the coin or metal would be a bit porous.&nbsp; All metals have a porousness of some degree, and absorb things like moisture from the atmosphere.&nbsp; Anyone who&#039;s work with vacuum systems knows that the metal vacuum vessel has to be baked out to boil out the moisture that fills these pores in the metal and ruins the vacuum.&nbsp; S</p><p><br /></p><p>So, maybe when the ancient gold coin was freshly minted the original holder ate some fried chicken and got chicken grease imbedded into the metal.&nbsp; Then what you are seeing isn&#039;t the toning of the gold, but the discoloration of the chicken grease left behind by the handler.[/QUOTE]</p><p><br /></p>

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