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<p>[QUOTE=&quot;DoK U Mint, post: 1079798, member: 18848&quot;]<font face="Comic Sans MS"><font size="3">From personal experience.......I tried a ultrasonic cleaner on some flood plain recovery Lincoln cents from the PRE</font></font><font face="Comic Sans MS"><font size="3">~20&#039;s (as it turned out after removing the mud &amp; clay) in distilled water.</font></font></p><p><font face="Comic Sans MS"><font size="3"><br /></font></font></p><p><font face="Comic Sans MS"><font size="3">I was not pleased with the results. But it did allow me to discover the dates of the coins I&#039;d dug up. The color left behind was just too &quot;off&quot; with the crud removed. May have been the mud they had been buried in or the attempt to get to just the coins.</font></font></p><p><font face="Comic Sans MS"><font size="3"><br /></font></font></p><p><font face="Comic Sans MS"><font size="3">Your results may very. </font></font></p><p><font face="Comic Sans MS"><font size="3"><br /></font></font></p><p><font face="Comic Sans MS"><font size="3">I&#039;m an adventurous fellow and you can be too. Just pull some pocket change out and try it yourself if you have a U/Cleaner on them.</font></font></p><p><font face="Comic Sans MS"><font size="3"><br /></font></font></p><p><font face="Comic Sans MS"><font size="3">Highly diluted NH3 (ammonia) was recommended by others and it only made the coins look.........manipulated.</font></font>[/QUOTE]</p><p><br /></p>

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