Used primarily in hair dye formulations to achieve various shades by reacting with other dye components. It acts as a coupling agent, enhancing color intensity and stability. Also employed in photographic developers, where it aids in the reduction of silver halides to produce high-quality images. In analytical chemistry, it serves as a reagent for detecting specific compounds due to its sensitivity and reactivity. Additionally, it finds use in organic synthesis for creating complex molecules in pharmaceutical and chemical industries.