White shiny face-centered cubic structure metal, soft, ductility second only to gold, is an excellent conductor of heat and electricity; does not react with water and atmospheric oxygen, and turns black when exposed to ozone, hydrogen sulfide and sulfur ; It is inert to most acids and can quickly dissolve in dilute nitric acid and hot concentrated sulfuric acid. Hydrochloric acid can corrode the surface and dissolve in molten alkali hydroxide, peroxide alkali and alkali cyanide in the air or in the presence of oxygen; Most silver salts are sensitive to light and are insoluble in many acids.