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<p>[QUOTE=&quot;-jeffB, post: 8297030, member: 27832&quot;]See above. Bleach is basically alkaline salt water with extra chlorine dissolved in it. Salt is <i>terrible</i> for most metals; free chlorine is worse. And zinc and aluminum are both <i>amphoteric</i>, reacting with both acids and bases, so coins made of either metal will be attacked by <i>both</i> acids and alkalis.[/QUOTE]</p><p><br /></p>

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