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<p>[QUOTE=&quot;BadThad, post: 977209, member: 17261&quot;]Because H2S is a gas and it&#039;s everywhere and it&#039;s highly reactive. Not to say that other forms of sulfur such as sulfates, sulfites, etc. can&#039;t contribute, but they are less likely to make it to the surface of a coin unless it&#039;s exposed to liquid.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Coins are &quot;toned&quot; within seconds of being minted. A layer of cuprous oxide (Cu2O) is instantly formed and actually provides a layer of protection. The green stuff on the statue of liberty is actually not an oxide, but verdigris. It is copper chloride formed by the exposure to sea water.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Yes, oxidation occurs first, but trace levels of hydrogen sulfide are present in all air. The natural sources of H2S are many, I suggest you google it.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>The oxidation layer is harmless, it provides protection and doesn&#039;t need to be &quot;cleaned&quot;. As long as it doesn&#039;t get too thick and begin the conversion to curpic oxide (black) there&#039;s no problem.</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>COOL! I&#039;m sure he&#039;s a lot smarter than I am. We have some PhD&#039;s in this forum that also a lot smarter than I am. I don&#039;t claim to know everything about coins and chemisty. I just do my best because the topic interests me greatly. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie6" alt=":cool:" unselectable="on" unselectable="on" /> </p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>Just one other product, see my sig. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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