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<p>[QUOTE=&quot;ArtDeco, post: 8395010, member: 119259&quot;]Thanks for your take on the subject.</p><p>I&#039;m guessing the reason some reactions happen in cabinets are due to the hint amounts of sulfur in the materials used to store the coins. </p><p>My theory is that such small amounts of sulfur in combination with oxygen can change a small area of a silver coin into a variety of colors.</p><p><br /></p><p>I&#039;ve sort of done this with liver of sulfur and coin silver and even fine silver. If you use cold water mixed with liver of sulfur, the silver won&#039;t change color but as you slowly add boiling water to the mix you will see a much slower process of oxidation, you will see the silver turn different colors from a yellow/golden hue to a light/dark blue to a charcoal black. </p><p><br /></p><p>It&#039;s hard to get that iridicent toning in short time but I think this is just a process of the coin getting exposed to teeny trace amounts of sulfur that you will start to see a rainbow hue in some areas of the coin.</p><p>It&#039;s like small amounts of sulfur is finely painting a rainbow on the surface of the coin.[/QUOTE]</p><p><br /></p>

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