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<p>[QUOTE=&quot;Colonialjohn, post: 2384885, member: 57741&quot;]Insider - you make a good point. In terms of that NJ Copper it was harshly cleaned - chemically - not mechanically - as the surfaces were free of hairlines or more accurately circular hairlines under a loop. So its restoration was a good thing but even most experts can tell that it was restored (X) years ago but semi-olive brown is always better than ORANGE. I normally only clean copper when its just a green oxide on the surface or is a superficial green coating if you will. Any other copper oxide color (no point in getting into various colors of copper oxides) and/or if its deep its futile - of course - IMO). Cleaning copper takes some skill. Some experts I talk to at EAC do of course favor xylol but I developed a cleaner based on the original Coin Care - but I care not expound further. It works pretty good and had no complaints yet.</p><p>Some commenters have said its not that effective or strong - but Insider you know and I know how SENSITIVE a copper surface is in Mint State. The cleaner was made strong enough as not to effect the original mint red pieces and not effect the cartwheel effect. So its potency was limited ... &lt;VVBG&gt;.</p><p><br /></p><p>JPL[/QUOTE]</p><p><br /></p>

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