Question

Why silver jewelry turn dark over a period of time

Answer 1

Answer:

Sterling silver turns dark or stains because of a chemical response caused by contact with sulfur or hydrogen. A food or ordinary things containing sulfur can cause discoloring, but even dirtied air can turn sterling silver dark.

It's stain - a sulfur response in the metal. Happens to all silver, but it's worst on a few people in light of the fact that the skin accelerates the chemical response.

Answer 2

Over a long period of time, the outer surface of silver gets oxidised and the colour of the tarnish on silver is black.
Hope this helps.
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