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<p>[QUOTE=&quot;Just Carl, post: 683101, member: 4552&quot;]Guess you missed my answer. Basically Gold doesn&#039;t combine with many, many other elements or compounds. It does not Oxydize if you think that all toning is Oxygen based. Gold does combine with some gasses such as Chlorine or Flourine though. The worst thing for Gold is the presence of so much SO or SO2 in the air. Sulfur also reacts with Gold to form Au2S. Many areas where Sulfur Coal has or is being burned creats the SO or SO2 in the air, mixed with Moisture, H OH, it forms an acidic gas that attacks many, many things. You may have heard the expression ACID RAIN. What I just described is exactly that. This causes Copper items, pipes, ground rods, lightning protection systems to disintigrate. AND, the forming of Au2S on your Gold Coins. </p><p>Toning on coins is an expression and although many may just say corroding, tarnishing, rusting, rotting, etc., this toning is a combination of a metal and other substances. True that Gold mixed with other metals may take on different tones due to the other metals combining with different substances that Gold does not combine with.[/QUOTE]</p><p><br /></p>

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