reaction of silver with milk products
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Silver and silver-plated objects react with sulfur and sulfur compounds to produce silver sulfide Ag2SAgX2S or tarnish. Contact with materials that contain sulfur compounds, such as hard boiled eggs, mayonnaise, mustard, and rubber bands can cause tarnish. In the air, a silver object can tarnish owing to the reaction of silver with hydrogen sulfide (H2SHX2S). This is a gas found in the air as a result of some industrial processes and the decomposition of dead plants and animals. The reaction of silver with hydrogen sulfide to form tarnish is as follows:
2Ag(s)+H2S(g)⟶Ag2S(s)+H2(g)
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