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<p>[QUOTE=&quot;cladking, post: 3172519, member: 68&quot;]Mint set packaging has destroyed millions of coins of various dates.&nbsp; The worst affected are the &#039;68 to&nbsp; &#039;71 and the &#039;74 to &#039;80.&nbsp;&nbsp; Many others are also badly affected but usually less so.&nbsp; </p><p><br /></p><p>Acetone will often save some of these coins but I&#039;ve found a better solution is about 80% isopropyl and 20% acetone.&nbsp; Let them soak for a few days.&nbsp;&nbsp; Be certain the alcohol is 91% alcohol rather than the diluted 70% because water will ruin clad.&nbsp;&nbsp; Don&#039;t let the solution get too old or the water concentration will rise.&nbsp; </p><p><br /></p><p>Rinse them in warm water and spread them out on a towel to blot dry.&nbsp; Flip and blot a second time.&nbsp; </p><p><br /></p><p>When this doesn&#039;t work (and it often won&#039;t) then the only thing left is a 1% solution of high quality ammonia and water. Dip briefly rinse immediately and blot dry.&nbsp; Caution; the ammonia will ruin the coins with significant exposure.&nbsp;&nbsp; Consider this process a last resort.&nbsp; Coins with much exposure will appear cleaned and the solution turns green.&nbsp; I tend to slowly increase the concentration until they are all ruined.&nbsp;&nbsp; </p><p><br /></p><p>Probably all coins should be removed from mint sets and stabilized in alcohol.&nbsp; I wish I had done this to all my coins long ago.&nbsp;&nbsp; Alan Herbert suggested cutting the coins out right in the mint set packaging so a lot of my Gems are just ruined.[/QUOTE]</p><p><br /></p>

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