Question

what is the colour change of silver and copper after corrosion ?​

Answer 1

silver turns into black and copper turns into green after corrosion...;)

Answer 2

Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of corrosion. In the case of silver tarnish, the silver combines with sulfur and forms silver sulfide ( Ag2S ) which is black.

Copper turns green because of chemical reactions with the elements