Copper and silver express the "oligodynamic effect," a tendency for antibacterial action, most strongly. Brass is a useful alloy of copper that does not oxidiz

Copper and silver express the "oligodynamic effect," a tendency for antibacterial action, most strongly. Brass is a useful alloy of copper that does not oxidize and also exhibits this effect. https://en.wikipedia.org/wiki/Oligodynamic_effect https://en.wikipedia.org/wiki/Oligodynamic_effect