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<p>[QUOTE=&quot;Roerbakmix, post: 5197869, member: 100731&quot;]Sulfur tends to do that. Earlier, I tried to repatinate a super shiny silver coin with elemental sulphur. I heated it in the oven, then forgot about it, only to find a 200 C completely black coin with molten sulphur attached. After some cleaning (the coin did not turn out nice), some similar blueish patina remained as on your coin. </p><p><br /></p><p>Do not bake your coins.[/QUOTE]</p><p><br /></p>

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