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<p>[QUOTE=&quot;kanga, post: 396997, member: 9270&quot;]As I recall:</p><p>The coating aluminum gets is generally Al2O3 (aluminum oxide.)</p><p>VERY tough stuff and VERY hard to deal with short of abrasive action.</p><p>The good news is that once it&#039;s formed it actually seals the aluminum surface and most further problems are avoided.</p><p>This is good for lawn furniture; it is not good for coins (unless you decide to live with that look.)</p><p>&nbsp;</p><p>Zinc does the same thing, oxidize (although I&#039;m not sure the whitish powdery stuff is ZnO. But it&#039;s something undesireable.)</p><p>Problem is that it IS powdery and comes off rather easily.</p><p>This leaves pitting.</p><p>Not good.</p><p>&nbsp;</p><p>In both cases the best cure is preventative.</p><p>Put them in something that seals them off from contact with the air.</p><p>Flips, 2x2&#039;s and Airtites are some possibilities.[/QUOTE]</p><p><br /></p>

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