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Old 18th February 2018, 12:43 PM   #14
kai
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Join Date: Apr 2005
Posts: 3,218
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Hello Detlef,

Thanks for the pics! I wasn't directly referring to your posting and my wording possibly wasn't clear enough.

I believe in these cases it's more like build-up of oil and dirt rather than typical patina. Still lower gold/silver alloys will also result in some oxidized metal, so this POV will be open to debate.

Regards,
Kai
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