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<p>[QUOTE=&quot;johnmilton, post: 3559438, member: 101855&quot;]To me the term &quot;corrosion&quot; implies something that is detrimental and possibly negative that is going to continue to cause damage. As a collector of early copper, which seems to be implied by your avatar, I would think that you would appreciate the brown protective coating, which collectors call patina, which forms on those coins.</p><p><br /></p><p>Were it not for that, copper would be more like zinc, and inappropriate for coinage. When the modern cent is lost in the wild, it is my understanding that it takes about a year or less for it to dissolve.</p><p><br /></p><p>I think that linking toning with corrosion is too hash of an application of the concept. Toning can provide a protective barrier from something much worse.[/QUOTE]</p><p><br /></p>

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