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<p>[QUOTE=&quot;kanga, post: 396655, member: 9270&quot;]I never had to deal with aluminum coins. US doesn&#039;t have any (at least none I&#039;ll ever own.)</p><p>&nbsp;</p><p>I know aluminum is a tough metal to deal with.</p><p>Highly reactive and bonds tightly when it oxidizes.</p><p>That&#039;s why it was a valuable metal for so many years (up there with gold or maybe higher.)</p><p>Hard to extract from its ore.</p><p>The Washington Monument is capped with a small pyramid of aluminum.</p><p>Done because the metal was so valuable. And that was in the mid 1880&#039;s.</p><p>&nbsp;</p><p>Zinc is another nasty metal to deal with.</p><p>&nbsp;</p><p>No help in answering your question.</p><p>But at least I understand your quandry.</p><p>I&#039;ll be interested in the answers you get.[/QUOTE]</p><p><br /></p>

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