compoundchem.com
Removing Tarnish from Silver
Silver tarnishes in air to form a black coating of silver sulphide, which has the formula Ag2S. The chemical equation for the formation of silver tarnish following reaction with hydrogen sulphide (H2S) is as follows: 2 Ag(s) + H2S(g) → Ag2S(s) + H2(g) There’s speculation