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<p>[QUOTE=&quot;Boss, post: 614869, member: 15110&quot;]Interesting RLM.&nbsp; I have thought about that.&nbsp; Ultimately its a mechanical means of removal.&nbsp; I think NCS does not use mechanical means of removal.&nbsp; They only use chemicals and that is a mistake.&nbsp; If I sent this coin and my 1909 S IHC they would have chemically cleaned the coin and messed those coins up likely.&nbsp; Grime comes off easily by a rose thorn and oil.&nbsp; I think water at high pressures would remove harder stuff like verdigris but water at high pressure is denser and due to surface tension and speed would take on properties of being like little pebbles maybe?&nbsp; If you have a machine that does this try it on a low value cents with slow mo camera.&nbsp; Would be a cool experiement.&nbsp; Water Pic is like 50 PSI I think.&nbsp; That would work good potentially.</p><p>&nbsp;</p><p>Coinkeeper: scratches look bigger because I didn&#039;t take good enough up close photos before the treatment.&nbsp; They were there the photos just don&#039;t show it.&nbsp; Any opinions on the grade anyone?[/QUOTE]</p><p><br /></p>

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