Silver Turing black when left exposed to air which reaction
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the reaction is oxidation/corrosion
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Rust is called oxidation, because oxygen in the air starts to chemically react with the iron's outer layers. Silver doesn't oxidize, though; it tarnishes, which is the same as saying that it forms a patina. Tarnish is formed when sulfur or sulfur compounds come into contact with silver. Sulfur is present as a free gas in our atmosphere, but it is becoming more prevalent in sulfur dioxide in air pollution from the burning of coal and gasoline.
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