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<p>[QUOTE=&quot;-jeffB, post: 4198563, member: 27832&quot;]That it does, and muriatic acid is more likely to attack any metal impurities in the zinc as well. It <i>can</i> attack copper too, though, if there&#039;s enough oxygen or other trouble-makers present.</p><p><br /></p><p>Oh, and I&#039;d forgotten (but Wikipedia hadn&#039;t) -- the copper shell is only 1.7% of the cent by weight; the other 0.8% is copper <i>alloyed with the zinc</i>. So, the copper skin <i>should</i> weigh less than 2.5% of the full struck weight.[/QUOTE]</p><p><br /></p>

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