Question

Why do silver articles turn black and copper turns green after sometimes?

Answer 1

Hey there!
It happens due to the presence presence of moisture and acid in the atmosphere.

It's called corrosion.

Hope it helps

Answer 2

Hello friend !
Here's ur answer! 
Silver articles turn black and copper turns green after sometimes
due to the presence presence of moisture and acid in the atmosphere which corrodes the metal. here, hydrogen sulphide changes silver to black and moisture in the atmosphere changes copper to green.


Hope it helps!!☺
Thanks!! ! ☺