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<p>[QUOTE=&quot;desertgem, post: 501770, member: 15199&quot;]Fish, you<b> shouldn&#039;t</b> see verdigris on .999 silver or .999 gold coins as the amount of copper possible is too small. On coins that are less, say 90% silver ,10% copper, verdigris can occur along with the silver corrosion compounds. I bought a NCG MS69 1/10 oz 2000 AGE ( 91.7% gold) at the club auction, and there are copper spots with visible &quot;centers&quot;, tiny specks of something bad that initiated the corrosion. I would have thought the coin would be dusted or something before encapsulation<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie4" alt=":mad:" unselectable="on" unselectable="on" />. The copper spots are not the greenish verdigris color as gold being a noble metal does not combine with copper, but just &quot;mixes&quot; molecule wise. So the discoloration is the separate copper molecules reacting (corroding) and not the mass one has with 90% silver or cents. Thus the surface diffraction layer should be thin enough to only show a tint of darker yellow to light reddish color. If gold actually bonded with the copper, 90% gold coins would probably show the &quot;greenish&quot; color of verdigris also.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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