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<p>[QUOTE=&quot;Just Carl, post: 141003, member: 4552&quot;]As to toning of coins an important item is the material of the coin. Toning occurs in coins depending on where they are, what they are, how long they&#039;ve been there, temperature, humidity and just about anything else. </p><p>Invironment can play a massive or practically nothing amount of reactions in the toning of coins. For instance Silver does react easily with many, many other elements and compounds. Although Copper is highly reactive as a metal it does not react as easily as Silver. Silver can form Ag2S as well as AgCl easily whereas copper dose not react with S or Cl directly but will with one of their compounds such as the Cl or S acid group. </p><p>&nbsp; If you are truly interested in how and why coins tone I would suggest acquiring a chem book rather than attempting to decipher numerous guesstamated possibilities.[/QUOTE]</p><p><br /></p>

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