I have made a silver ring with a copper bezel setting on a silver base, it looks good but I want to set a moonstone and don't want the copper to turn green inside after I have set the stone. can anyone suggest a coating or lacquer i could use on the copper to prevent it tarnishing without it forming a thick skin? I thought about using nail varnish or even thinned down nail varnish ,has anyone any better ideas ?
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