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<p>[QUOTE=&quot;desertgem, post: 1622827, member: 15199&quot;]One should research what is actually happening to allow the date to show under these solutions. It isn&#039;t just the pH. An acid would reduce a un-struck planchett equally all over. The striking process alters the crystal structure of the copper nickel so the area of the date ( and a few other areas most don&#039;t notice unless they do a full coin treatment), is different on the molecular level than the surrounding fields. An acidic ferric chloride solution ( used to be used to etch copper off of pc boards for those of us who built home made units is much better than vinegar or other mineral acids. If you intend to do it, I think the commercial product is worth the price, but vinegar is cheap I recognize. And sorry, I still feel they are damaged coins. IMO.[/QUOTE]</p><p><br /></p>

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