Used in the synthesis of hair dyes and pigments due to its ability to form stable color compounds through oxidative coupling. Commonly employed in cosmetic formulations for permanent and semi-permanent hair coloring products. Also serves as an intermediate in the production of azo dyes and functional polymers. Its reactivity makes it valuable in developing light-stable and wash-resistant dyes. Additionally, it has applications in electrochemical research and the preparation of conductive polymers.