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<p>[QUOTE=&quot;Conder101, post: 2116008, member: 66&quot;]Well a 1 oz 999 fine gold coin weighs 31.1 grams or about 479 grains so that other 1 part would be about .479 grains of almost five times the size of that piece by the pencil point.&nbsp; The copper is only half the density of gold so double the size of that piece again.&nbsp; That .001 part copper is now ten times the size of the piece by the pencil point.&nbsp; And then an area creating a copper spot only need to be a few atoms in thickness.&nbsp; The amount of copper we are talking about is about half the amount used to plate a current Lincoln cent.&nbsp; And the plating on that cent is a LOT more than just a few atoms in thickness.&nbsp; So yes I could see that amount of copper causing good sized copper spots on a 1 oz 999 fine gold coin.[/QUOTE]</p><p><br /></p>

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