Why does the silver turn black ?

After a while, does sterling silver change color? - Quora

When silver is exposed to the elements, it can react with sulfur in the air to form a black tarnish. This reaction is called tarnishing, and it can occur over time due to exposure to air and light. The tarnish is actually a thin layer of silver sulfide that forms on the surface of the silver. This layer can be removed with a silver cleaner or a polishing cloth.

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