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<p>[QUOTE=&quot;7Jags, post: 4357379, member: 78719&quot;]I&#039;m not sure if that is correct as the explanation has been that the oils are acted on by bacteria and generate organic acids that etch the coin. A dip is applying acid to acid to essentially burn off the oxide by oxidizing it further. The ammonia will neutralize the oxidation reaction and should be tried IMO prior to going to a stronger acid. Skin moisture will dry out &amp; interestingly is slightly &quot;basic&quot; (greater than pH 7.0).[/QUOTE]</p><p><br /></p>

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