I had no idea about that. Wikipedia entry, "Antimicrobial properties of copper" was also an eye-opener: https://en.wikipedia.org/wiki/Antimicrobial_properties_of_co...
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This is why people used silver and copper for pots, plates and cutlery for ages.
Overusing silver leads to blue pigmentation - hence 'blue blood' - as mostly upper classes used silver plates.
“Blue blood” has nothing to do with argyria: https://www.etymonline.com/word/blue-blood