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<p>[QUOTE=&quot;Lord Geoff, post: 1578414, member: 42001&quot;]I&#039;ve read about the heating and freezing and it can shatter coins and there is another extremely bad side effect as well although I don&#039;t recall at the moment.</p><p><br /></p><p>Basically, if the standard treatments of brushing and distilled water/olive oil soaks are just flat out not going to work (say like six months gets you nowhere) you have four options:&nbsp; </p><p><br /></p><p>1.&nbsp; Give up on the coin.</p><p>2.&nbsp; Electrolysis - will probably get the concrete off but will probably remove the patina as well.&nbsp; This one is highly debated, somewhat similar to cleaning modern coins.&nbsp; Although some people argue on the side of electrolysis is ok - no one argues cleaning is ok.</p><p>3.&nbsp; Lye and water - will probably get the concrete off.&nbsp; Will probably kill some of the patina and metal of the coin too.&nbsp; Will possibly burn your skin and also can permanently blind you.&nbsp; This has a better chance of leaving the coin in better shape than electrolysis but can also permanently scar you.</p><p>4.&nbsp; Let a bunch of junk coins gather up and get your mad scientist on...Distilled water as an alternative to olive oil was discovered relatively recently so it&#039;s not like this is a fully explored scientific niche.</p><p><br /></p><p>The other options (rock tumbers, ultrasonic cleansers, etc.) all have negative side effects and don&#039;t work as well as #2 or #3.</p><p><br /></p><p>Again this is just from my research not personal experience so some of it could be wrong.[/QUOTE]</p><p><br /></p>

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