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<p>[QUOTE=&quot;-jeffB, post: 1772010, member: 27832&quot;]It&#039;s certainly possible in principle, especially if they get damp. That would tend to make the copper corrode away, while protecting the silver -- but &quot;protecting&quot; here just means &quot;slowing down its oxidation/corrosion&quot;, and no guarantees that it wouldn&#039;t make unsightly spots.</p><p><br /></p><p>In the same way, zinc protects copper or iron if they&#039;re in contact. So the zinc coating on steel cents tended to protect the steel core, while the zinc filling in modern cents tends to dissolve away if there&#039;s a nick in the copper coating, leaving a deep pit. That&#039;s one of the main reasons that copper-coated zinc coins are a stupid idea.[/QUOTE]</p><p><br /></p>

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