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<p>[QUOTE=&quot;halfcent1793, post: 3925131, member: 86853&quot;]I concur with almost everything that GDJMSP writes above. However, it is quite possible that another reason there are so many red rather than RB coins slabbed (I haven&#039;t checked this but will defer to his greater knowledge on the subject) is that red coins are worth substantially more in the marketplace, so relatively more would be slabbed. </p><p><br /></p><p>That does not negate his absolutely correct statement that copper coins can be and have been dipped. I will add that people have bought such things as original red coins. </p><p><br /></p><p>He is also right that few people would be knowledgeable enough to dip a copper coin without damaging it. Silver dip absolutely does corrode copper coins. I have also tested the dip that is supposed to be specifically for copper, and it, too, destroys the surface. I did a series of studies of what different cleaning agents do to early coppers and published it in 2018 in <i>Penny-Wise</i>. </p><p><br /></p><p>The purpose of that study was to trash some relatively inexpensive old copper coins in the hope that others wouldn&#039;t trash their own, much nicer coins.</p><p><br /></p><p>I would recommend that NOBODY try to dip a copper coin that has significant value, and any old US copper coin that is UNC has significant value.[/QUOTE]</p><p><br /></p>

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