Used primarily in hair dye formulations as a coupler to produce permanent and oxidative color shades. It reacts with primary intermediates like p-phenylenediamine in the presence of hydrogen peroxide to form larger colored molecules that remain in the hair. Its structure allows for the development of natural-looking brown to black tones, especially in combination with other dye components. Due to its amine and phenolic groups, it contributes to color intensity and longevity while offering good compatibility with other ingredients in cosmetic products. Commonly found in commercial hair coloring products, including creams, lotions, and gels.