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<p>[QUOTE=&quot;Bart9349, post: 681439, member: 5682&quot;]Although I am certainly no expert and I really don&#039;t collect coins, one of the bullion coins I &quot;accumulated&quot; had some unsightly brown spots. Being very unhappy with its discoloration, I almost returned it, but kept it since it was mostly for bullion purposes.</p><p><br /></p><p>For whatever reason (possible free submission), I submitted it to NGC and it came back MS 64. I was quite surprised that it graded so highly. (I was worried it might be body bagged.) </p><p><br /></p><p>I have since learned that the copper or other alloys used to make the soft gold harder can oxidize, creating unattractive dark spots. This discoloration,&nbsp; surprisingly, has little effect on grading.</p><p><br /></p><p>guy[/QUOTE]</p><p><br /></p>

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