Used in medicine to treat cyanide poisoning by converting cyanide into less toxic thiocyanate, which is then excreted in urine. Also applied in dermatology to treat certain skin conditions like tinea versicolor. In water treatment, it neutralizes chlorine after disinfection, making it safe for aquariums and ponds. Commonly used in photography as a fixing agent to remove unexposed silver halides from photographic film and paper. Employed in analytical chemistry during iodometric titrations to determine the concentration of oxidizing agents. Also utilized in textile industries to remove excess chlorine after bleaching processes.