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<p>[QUOTE=&quot;rotobeast, post: 263172, member: 8671&quot;]There is a lot of oxidation from coming in contact and reacting with different metals.</p><p>If you ever look at a machine that has an aluminum part next to a stainless steel one, you&#039;ll see what I mean.</p><p>A black powdery substace starts to build up.</p><p>Considering all the places our coins travel through, I&#039;m sure they sit in bins made of various metals for lengthy periods.</p><p>As has already been mentioned, oils from handling, changing the pH balance on the surface, doesn&#039;t help.[/QUOTE]</p><p><br /></p>

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