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<p>[QUOTE=&quot;jeankay, post: 413589, member: 12159&quot;]This was a common date and heavily encrusted copper IHC I used.</p><p>The original idea was to see if the MS 70 could restore the coin by removing the encrustation. When I put the coin in the solution it began bubbling around the edges immediately. That is when I decided to find out what this chemical could do to a coin if left in the solution too long. When I removed the coin the next day about all that remained of the experiment was the crust. </p><p>The exercise turned into an experiment about why one should be very cautious about using chemicals of unknown ingredients to clean or restore coins. In this case it was the copper that suffered the most, the encrustation was much stronger.</p><p><br /></p><p>Now I have a bottle of the offending &#039;coin cleaner&#039; that I will probably need to turn over to hazardous waste disposal to be rid of.</p><p><br /></p><p>jeankay[/QUOTE]</p><p><br /></p>

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