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<p>[QUOTE=&quot;ToughCOINS, post: 1817858, member: 20480&quot;]While I have no way of being positive, they appear to be more than &quot;skin deep&quot;, as is possible when oxygen permeates silver, which can happen under certain conditions . . . this phenomenon is beyond the bounds of my knowledge . . . would have to do research when I can spare the time.&nbsp; I know I have had many silver coins in the past with such black streaks left on them by long term contact with rubber bands (extremely high sulphur content).</p><p><br /></p><p>Perhaps there&#039;s an inciteful chemist out there who would take a few minutes to enlighten us.</p><p><br /></p><p>&nbsp;- Mike[/QUOTE]</p><p><br /></p>

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