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RE: Why I Drink Water From a Copper Vessel!
So does oxidization make the copper or silver drinking cup pointless then?
BTW, there are band-aids that have silver in them for the anti-microbial properties.
As I understand it the oxidised forms of silver and copper have a greatly diminished effect. Silver in various forms was widely used for its antibiotic properties prior to the discovery of the more modern, and much more effective antibiotics. There is a Wikipedia article on the Medical Uses of Silver that will provide you with more information.