Used in the synthesis of dyes and pigments, particularly azo dyes, due to its ability to act as a coupling component in diazotization reactions. It serves as an intermediate in the production of textile dyes, where it contributes to color development and stability. Also employed in the preparation of certain pharmaceuticals and biological stains for microscopy, aiding in the visualization of cellular structures. Its reactivity makes it valuable in organic synthesis for building complex aromatic compounds.