Used in hair dye formulations as a coupling agent in oxidative colorants, enhancing shade range and color stability. It reacts with primary intermediates like p-phenylenediamines in the presence of hydrogen peroxide to form larger colored molecules within the hair shaft. Its methoxy and amino groups contribute to improved hue and durability, particularly in producing warm brown to reddish tones. Also found in some specialty dye applications for textiles and imaging due to its reactivity and solubility profile.