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    What conditions can help silver coins develop rainbow colored toning?

    Question #128617. Asked by nautilator. (Dec 27 12 12:07 AM)


    rossian

    		The rainbow toning is caused by the formation of a layer of silver sulfide on the coin surface, and this is aided by the presence of heat and humidity. This article explains the process in detail:

    http://www.cointalk.com/t84670/

    Dec 27 12, 1:18 AM

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