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<p>[QUOTE=&quot;bruthajoe, post: 8085938, member: 108656&quot;]That would be the base equivalent of diluted hydrochloric. Acids and bases both being corrosive to metals are going to be invasive to the surface of alloy coins, how invasive? Guess that depends on dilution and exposure but they sure do effectively remove contamination, or &quot;toning&quot; if you prefer. Now after a few days, even though I thoroughly rinsed the coins after the HCl dip I am noticing a dullness with the clads, especially the dimes and toning on the cents. So either I have not successfully neutralized the reaction or the surfaces have been chemically altered and are rapidly oxidizing. Like I said. I had to try it.[/QUOTE]</p><p><br /></p>

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