Used as a key intermediate in the synthesis of azo dyes and pigments, particularly for producing high-performance acid dyes with strong affinity for protein fibers like wool and silk. Its structure enables excellent color fastness and light stability in dyed textiles. Also employed in the formulation of metal complex dyes where it chelates with metal ions to enhance thermal and UV resistance. Additionally, finds use in analytical chemistry as a chromogenic reagent for detecting certain metal ions due to its ability to form colored complexes.