Plated silver. Not much you can do. Mild soap is yer only option.
I wouldnt drink out of it thou. Number #1 is that it is plated.
I am a Jeweler. So thats my knowlegde. PLus if it is Antique. I wouldnt drink out of it.
Cj2112 had some great advice. But i still wouldnt drink out of it :>
:<
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