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<p>[QUOTE=&quot;CappedBustDimes, post: 365250, member: 9104&quot;]I encountered this crystalline pattern on a few IH 1c that were housed in old 2x2s.&nbsp; I am uncertain of the brand name of the holders but, they were made in the 50&#039;s-60&#039;s and had green font w/ a space for the the year and denomination.</p><p><br /></p><p>In my case this pattern was a result of toning from the &quot;cellophane&quot; holder.&nbsp; I did a bit of research and found that the cellophane from this period was susceptible to and often suffered from a fungal degradation caused by it&#039;s storage environment.</p><p><br /></p><p>The pattern was removed by a simple dip which confirmed that the pattern was a result of &quot;toning&quot; and not improper mixing of alloys.[/QUOTE]</p><p><br /></p>

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