Used as an intermediate in the synthesis of azo dyes and pigments, particularly for producing yellow and orange shades with good lightfastness. Employed in the preparation of fluorescent dyes due to its naphthalene backbone, which supports strong light emission. Acts as a building block in the manufacture of certain pharmaceuticals, especially in compounds requiring aromatic amine functionality. Also utilized in biochemical research as a fluorescent labeling agent for proteins and nucleic acids. Its carboxylic acid group allows for easy conjugation, making it valuable in developing sensors and probes.