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<p>[QUOTE=&quot;lordmarcovan, post: 2602451, member: 10461&quot;]We <i>are</i> talking about heavily encrusted stuff that&#039;s not too corroded or unstable- just encrusted.</p><p><br /></p><p>I&#039;ve found the peroxide method similar to electrolysis.</p><p><br /></p><p>With both, one would probably want to be cautious with heavily corroded or otherwise &quot;unstable&quot; pieces.&nbsp; I ruined my first dug large cent trying to clean it with electrolysis, which had otherwise done well for me, particularly on silver.&nbsp; The coin was a 1796-1807 Draped Bust cent- I could just tell from the faint details when I dug it- but it was already corroded.&nbsp; In my misguided attempt to coax a date off of it with electrolysis, I &quot;burnt it up&quot;- because it was already pretty heavily corroded, it ended up a featureless slug after the electrolysis.</p><p><br /></p><p>So yes, there are good candidates for the peroxide treatment (or electrolysis) and other things that are perhaps not so much.&nbsp; With either the peroxide or electrolysis treatments, a very short exposure might work well.&nbsp; I just &quot;zapped&quot; that large cent for too long in the electrolyis solution.&nbsp; A minute or less, and it might&#039;ve been OK (or at least no worse than it already was when it came out of the ground).[/QUOTE]</p><p><br /></p>

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