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<p>[QUOTE=&quot;cladking, post: 2542579, member: 68&quot;]I can&#039;t vouch for how stable this is but I can get ~94% of the bad dates clean.&nbsp; Ones that are far gone and have &quot;porous&quot; surfaces like the &#039;69-P quarters often are are more problematical. </p><p>&nbsp;</p><p>I start simple with a mixture of 91% isopropyl alcohol and acetone.&nbsp; The acetone isn&#039;t real important for most dates.&nbsp; Just a little is plenty.&nbsp; Don&#039;t use any water at all.&nbsp; After a few days rinse the coins in warm water and separate out the ones that are still bad.&nbsp; Be sure to dry with a good towel or dry with acetone. </p><p>&nbsp;</p><p>Save the alcohol as it can be used a few times before being demoted to an alcohol rinse. </p><p>&nbsp;</p><p>The bads coin need a quick dunk in warm amonia (~120 degrees).&nbsp; Avoid breathing fumes so cover it between dips.&nbsp; Rinse these in water dip then in an alcohol dip and finally in running warm water.&nbsp; Dry. </p><p>&nbsp;</p><p>I&#039;m storing them in plastic tubes now and the Gems in 1 1/2 x 1 1/2&#039;s or flips. </p><p>&nbsp;</p><p>After the second use the alcohol doesn&#039;t seem to be good for much.&nbsp; It works for killing fungus so I use it for that.&nbsp; It would make good fuel but the vapors are probably harmful.&nbsp; This process has been evolving.&nbsp; The resultant is probably stable and is not degraded from what it was before the tarnish... ...I hope.[/QUOTE]</p><p><br /></p>

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