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<p>[QUOTE=&quot;Lehigh96, post: 3258355, member: 15309&quot;]I already told you what is the likely cause of the toning.&nbsp; It is the piece of paper inside the flip.&nbsp; When you allow air flow by exposing part of the coin, the sulfur from the paper will cause the toning layer to form.&nbsp; The same result happens if forget to replace and acetate slide in a Dansco ablum.&nbsp; I purchased the Barber Quarter shown below as a blast white coin which I knew had been dipped.&nbsp; I stored it in a Dansco album and accidentally forgot to replace the obverse acetate slide.&nbsp; Six months later, and viola!</p><p><br /></p><p><img src="https://i.imgur.com/oF63hjT.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>The obverse developed a peripheral secondary toning while the reverse which had it&#039;s slide intact remained untoned.&nbsp; Additionally, I had other blast white coins stored in the same album that never toned at all because their slides were intact.</p><p><br /></p><p>I don&#039;t know why that little piece of paper has such a high sulfur content, but if you remove it, I would bet that the coin will stop toning, assuming you are telling us all the relevant information we need to know about your basement conditions.[/QUOTE]</p><p><br /></p>

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