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<p>[QUOTE=&quot;desertgem, post: 428886, member: 15199&quot;]HarryJ,</p><p><br /></p><p>&nbsp;&nbsp;&nbsp; Gold does not combine chemically with the copper or silver, they stay separate chemically. If it is a good job of mixing, the non-gold material would be as small as possible and very evenly distributed in the gold matrix, even to the level of not being discernable even with strong magnification. Such gold coins appear to tone slightly over a long period of time if at all, not having visible spots of color, but overall. Some use to call this &quot;old gold&quot; color. Bullion gold @ .999 purity should not have this problem unless a bad mix is produced. </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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