Used as a key reagent in colorimetric analysis for the detection of metal ions, particularly iron (Fe³⁺). It forms highly colored complexes that allow for sensitive and selective determination of trace metals in environmental and biological samples. Also employed in the synthesis of azo dyes, contributing to the development of dyes with improved lightfastness and solubility. Its structure supports conjugation in dye molecules, enhancing color intensity and stability. Additionally, it serves as an intermediate in pharmaceuticals and analytical chemistry for developing sensors and diagnostic tools.