This chemical is primarily used as an intermediate in the synthesis of dyes and pigments, particularly for creating water-soluble azo dyes. Its hydrazinyl group allows it to participate in coupling reactions, forming complex dye structures with strong color properties. It is also employed in the preparation of fluorescent probes and markers for biochemical research, aiding in the detection and analysis of specific molecules. Additionally, its sulfonic acid groups enhance solubility in aqueous solutions, making it suitable for applications in textile dyeing and paper coloring industries.