Used as an intermediate in the synthesis of azo dyes and pigments, particularly for producing red and orange shades. It plays a key role in dye coupling reactions due to its reactivity in diazotization processes. Also employed in the formulation of indicators and biological stains for microscopy. Its sulfonate group enhances water solubility, making it suitable for applications in aqueous dyeing systems for textiles and leather. Additionally, it finds use in analytical chemistry for detection of certain metal ions.