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<p>[QUOTE=&quot;medoraman, post: 1631218, member: 26302&quot;]It gets to be a question of balance. If the emissions stay the same or lower, the surface reaction can stop. That is what happens in a lot of our coins, they toned because of the envelope or cabinet we put them in, an equilibrium gets established, and while in the same conditions the surface can remain stable. </p><p><br /></p><p>Put the same coin in a situation of non-equilibrium, like a moist environment, and there can be continued pressure for it to continue to oxidize. In such an environment, the end game will always be the same, total destruction.</p><p><br /></p><p>So, what has happened to the coin in the past is not what matters, its under what conditions you store it in the future that will dictate future damage/toning. I would say most toned coins will be stable in good coin storage conditions. Fresh silver or copper, though, even in &quot;good&#039; storage conditions will tone, they need near ideal conditions to not tone. However, ANY coin, no matter if toned of not, will tone or start toning again if placed in poor storage conditions, like a damp environment with a sulfur source. As long as they remain in those conditions, no equilibrium can be obtained, and it will result in damage and corrosion if left unchecked.</p><p><br /></p><p>Btw, to answer your question Bill, the toning starts on the top surface layer, but as it approaches black and goes into corrosion, the reaction goes deeper and deeper into the metal. Eventually the whole coin would be the reaction, like a porous coin. </p><p><br /></p><p>Like I said, what I will NEVER buy is a coin with matte black toning. You are almost positive the toning/corrosion has started to go deeper into the metal, and you have no idea how far.[/QUOTE]</p><p><br /></p>

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