Used primarily in the photographic industry as a developing agent for color films and papers, it facilitates the conversion of exposed silver halide crystals into metallic silver, enhancing image formation. It is also employed in hair dye formulations, where it acts as an intermediate to produce long-lasting color by reacting with other chemicals to form dye molecules. Additionally, it finds application in analytical chemistry as a reagent for detecting and quantifying substances like chlorine in water treatment processes. Its role in these industries highlights its versatility in both creative and technical fields.