Used in medicine to treat cyanide poisoning by converting cyanide into less toxic thiocyanate. Also employed in photography as a fixing agent to dissolve unexposed silver halides from photographic film and paper. Commonly used in water treatment to neutralize chlorine in swimming pools and aquariums. Applied in analytical chemistry during iodometric titrations as a reducing agent to determine oxidizing substances. Utilized in textile industries to remove excess chlorine after bleaching processes. Sometimes used in agriculture to supply sulfur and improve crop yield.