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<p>[QUOTE=&quot;physics-fan3.14, post: 6260033, member: 19165&quot;]Veeeery old Dansco&#039;s are known to tone coins. You&#039;ll see &quot;Dansco&quot; toned coins from the 1970&#039;s. </p><p><br /></p><p>Modern Dansco&#039;s, as far as I know, are made from archival quality materials that should not tone coins. </p><p><br /></p><p>Dansco toning was also universally from the rim, from contact with the folder. </p><p><br /></p><p>Given that the brown discoloration shown here is from the center of the coin, I strongly suspect that this is due to user error - whoever inserted the coins had dirty fingers when they pushed the coin into the slot. What you&#039;re seeing is finger oils reacting with the coin from when the coin was pushed into the holder. </p><p><br /></p><p>Every coin... right in the center... same color.... I&#039;ll bet if we had clearer pics, we&#039;d probably see fingerprints too.[/QUOTE]</p><p><br /></p>

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