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<p>[QUOTE=&quot;borgovan, post: 524550, member: 13016&quot;]The colors will only change if exposed to air. If you could keep them in an airtight container, they would theoretically stay the same for a very long time. Further exposure to air/contaminants will cause the existing colors to darken (they move along the progression of the rainbow), until eventually the entire coin would be covered with the thickest layer of silver oxide, and be black.[/QUOTE]</p><p><br /></p>

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