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<p>[QUOTE=&quot;mrbrklyn, post: 176565, member: 4381&quot;]Sometimes ....</p><p><br /></p><p>Most people are familiar with the fact that once iron and steel begins to rust, that it gets much wost unless chemically treated.&nbsp; I believe that is because the very organized structure of Iron and Alloys gives way to a system with more entropy when the rusted area and the non-rusted area are in contact.&nbsp; This creates a gibbs potential and Volia!&nbsp; RUSTED</p><p><br /></p><p><br /></p><p>OTOH, many metals actually use the coating to become more stable because of the coating.&nbsp; From an phys chem presprection this is counter intutitve (such as a hott air ballon rising) and it would have to do with examining the whole system.&nbsp; Examples of such metals would be anodized aluminum, the copper or bronze on many stautues (like the statute of liberty).</p><p><br /></p><p>Once corrosion happens on a coin, it will normally accellerate without intervention.&nbsp; I&#039;ve seen that with toning as well, especially pennies.&nbsp; Once they turn brown, they TURN brown.</p><p><br /></p><p>Silver is chemically very complex.&nbsp; I don&#039;t know much about the toning of Ag BUT, I know it is impacted by acids.&nbsp; If toning is because of some mild contact with an acidic environment, that will likely stop once the coroding factor is removed. Once my silver wine cup and candlesticks tone, they accellerate if not polished.</p><p><br /></p><p>But, this is all speculation on my part.&nbsp; I&#039;ll study this after fingerprinting dipped coins.</p><p><br /></p><p>Ruben[/QUOTE]</p><p><br /></p>

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