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<p>[QUOTE=&quot;-jeffB, post: 3944935, member: 27832&quot;]For what it&#039;s worth, I got the same result with plain white vinegar, no peroxide.</p><p><br /></p><p>Peroxide is an <i>oxidant</i>. It&#039;s good for reducing the color of organic stuff -- food stains and the like. Toning/tarnish on coins is <i>already</i> oxidized, and peroxide doesn&#039;t help with it. However, it can help acids attack some metals that they otherwise wouldn&#039;t.</p><p><br /></p><p>If you get any salt into the mix, even accidentally (say from softened tap water), things go downhill fast. An oxidizing acid solution with chloride ions will attack nickel <i>and</i> copper. In fact, it&#039;ll attack gold.[/QUOTE]</p><p><br /></p>

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