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Hi,
I see you
get no answer since yet.
Thai silver
contains all sorts of metals, at least it contains silver (Ag).
Mostly it is an
alloy with a lot of zinc. Sometimes it is silver plated. If you tumble such an
alloy, it get grey to black. I think this effect is not reversible. Maybe you
can silver coating it again.
If you buy
silver jewellery you must always have a
look whether it is stamped with 835,
925, 935 or with a moon or half-moon and with a hallmark. Such fantasy names
like Thai silver or Indian silver are always dubious and contains very seldom pure
silver.
Edmund
http://www.emailkunst.de