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<p>[QUOTE=&quot;cladking, post: 1070661, member: 68&quot;]Look at enough mint sets and you&#039;ll see these delaminate.&nbsp; I think it&#039;s usually caused by exposure to acidic enviroments but am not sure.&nbsp; If you scrape off the inside and burn it you get the tell tale green flame.&nbsp; If the coins are pressed against the interior or there is excessive temperature change the coin will first become hazy and then start forming a mottled corrosion.&nbsp; If you stop this soon enough the coins can be saved but there&#039;s a point beyond which I can&#039;t bring them back.&nbsp; </p><p><br /></p><p>Soak them in a solution of acetone and rinse in warm water.&nbsp; Remove the ones that are OK after patting dry. Then soak in a mixture of acetone and isopropyl or denatured alcohol.&nbsp; Finally whatever&#039;s left have to be soaked in mineral oil&nbsp; and then washed in detergents to remove the oil.&nbsp; 99% of the coins can be salvaged but I destroy a few inadvertantly in the process.&nbsp; Youhave to play around a little to find the right mixtures since the copper, copper nickel, and copper nickel clad require somewhat different techniques.&nbsp; </p><p><br /></p><p>The &#039;85 to date sets are probably OK.&nbsp; The &#039;68 to &#039;70 sets are awful.&nbsp; The &#039;71 to &#039;84 sets aren&#039;t too bad but a lot of the Ikes (being heavy I guess) are showing some trouble.&nbsp; Perhaps storing them on their edges will delay the problem.&nbsp; There are some specific problems in the later sets like the &#039;84-D cent is terrible.&nbsp; It&#039;s barely even 25 years old and half of these are bad already.&nbsp; </p><p><br /></p><p>Frankly the whole thing makes me sick to my stomach.&nbsp; I&#039;ve got several of each date that were selected just because every coin in them is a gem and I&#039;ll probably end up having to cut these and stabilize them as well. The day of a ready supply nice clad available cheaply is coming to an end whether there&#039;s any demand or not.[/QUOTE]</p><p><br /></p>

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