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<p>[QUOTE=&quot;-jeffB, post: 7842948, member: 27832&quot;]Oh, <b>please</b>, no.</p><p><br /></p><p>Metalworkers who pickle metal <b>aren&#039;t trying to preserve the original finish</b> of the metal. They want it to be free of contaminants, and don&#039;t care if it alters the luster of the surface -- they&#039;ll just polish or sandblast it back to the finish they want.</p><p><br /></p><p>Sodium bisulfate is a fairly strong acid. It&#039;ll dissolve the copper oxide on the surface of a copper coin, and leave a <b>completely unnatural</b> color behind. It&#039;s no better for coins than vinegar, or ketchup, or any other acid.</p><p><br /></p><p>(Okay, that last part isn&#039;t technically correct: there certainly <i>are</i> acids that would be worse for copper. Nitric acid will dissolve it completely, turning it into copper nitrate solution, with a heaping helping of toxic gas as a by-product.)[/QUOTE]</p><p><br /></p>

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