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<p>[QUOTE=&quot;SilverSurfer, post: 983287, member: 21603&quot;]Like elements have a tendency to cling to like elements....this is the principle of adhesion.&nbsp; The .9999 pure gold is likely to be an alloy (mixture) of gold and other elements (silver).&nbsp; That means that every part of the gold has some impurity in it.&nbsp; The entire surface is going to contain &quot;other element&quot; that make up the .01%.&nbsp; You won&#039;t find the other .01% metal all clumped together in one spot, although spots of higher impurity concentration can exist due to adhesion.&nbsp; The article is saying that the spot are localized higher concentration of silver sulfide.&nbsp; I&#039;d agree with the article as the methods they used to scan the metal are some of the most scientific we have to date.&nbsp; X-ray spectroscopy can tell you exactly what the metal in question is by the refractive and reflective properties of the object.[/QUOTE]</p><p><br /></p>

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