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<p>[QUOTE=&quot;medoraman, post: 978150, member: 26302&quot;]Fair enough that you say the process is &quot;slow enough&quot;, but the color is not just from the sulphur reaction, but also due to trace other compounds that will also be trapped in the reaction. My idea of an unstable matrix is concerning that if you speed a chemical reaction to occur faster than it normally would, than the matrix of links is not quite the same as if it occurred more slowly. This matrix may or may not be stable long term, while slower occurring reactions tend to builds more stable bonds. It has been a long time since inorganic chemistry, but that is a close paraphrase from the text. Since the reaction is not a &quot;clean reaction&quot; in which the only reacting chemicals are present, then the resulting reaction has unknown bonds forming.</p><p><br /></p><p>You have to admit that by definition retoning a coin has many more elements present than just silver or copper and sulphur, since that is the case I was just worried about the long term stability of the resulting reaction, how it would age, and how stable the chemical bonds would be, since they by definition are not quite the same bonds that would have occurred given a different time frame. Every coin we talk about have more metals in them than just silver or copper, also I haven&#039;t heard anyone saying to clean the surfaces first and do this where other gases are not present. That is the reason I was talking about an &quot;unstable matrix&quot; if I was unclear.</p><p><br /></p><p>Again, I am not saying your product could not be a good product, just that this point would be the only point I would worry about if I were to use your product to retone coins that have been cleaned.[/QUOTE]</p><p><br /></p>

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