Can anyone explain to me the chemical process of bronze tarnishing? According to Wikipedia:
Bronzes are typically ductile alloys, considerably less brittle than cast iron. Typically bronze oxidizes only superficially; once a copper oxide (eventually becoming copper carbonate) layer is formed, the underlying metal is protected from further corrosion.
Does this mean the tarnish that we see in the picture below is created by copper oxide turning into copper carbonate? If so, how do you write out that equation? What is being oxidized and what is being reduced?