Used as an intermediate in the synthesis of azo dyes and pigments, particularly for producing yellow and orange shades with good lightfastness and solubility. Commonly employed in textile dyeing, leather coloring, and in the formulation of inkjet inks due to its stability and chroma. Also serves as a derivatizing agent in analytical chemistry for detection of carbonyl compounds. Its sulfonic acid groups enhance water solubility, making it suitable for aqueous-based systems.