Why Hydrogen sulphide should not be mixed with Water?

Hydrogen sulphide (H2S) is a dissolved gas that gives water a characteristic "rotten egg" taste and odor. It corrodes piping, creates odors in the house, and turns water black. Homemakers will notice that it can change sterling silver to a black color almost instantly. hydrogen sulfide can cause odor problems at a concentration level as low as 0.05 mg/L.