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<p>[QUOTE=&quot;Kentucky, post: 2209203, member: 33176&quot;]Vinegar is 5% acetic acid, a weak organic acid.&nbsp; It is effective at cleaning because it can cause compounds of many metals to change to acetate salts by reaction.&nbsp; Acetate salts are very soluble so the schmutz can be rinsed away.&nbsp; Unfortunately if the schmutz is filling holes, scratches, etc. on the coin, the surface can be affected.&nbsp; Other than that, if all the vinegar is rinsed off, the only residual effect would be the reaction of the clean/reactive metal surface with the environment.[/QUOTE]</p><p><br /></p>

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