Used in the formulation of oxidative hair dyes, where it acts as a coupling agent to produce a range of permanent shades, particularly natural and warm tones. It reacts with primary intermediates like p-phenylenediamine in the presence of hydrogen peroxide to form larger colored molecules within the hair shaft. Its methoxy and amino groups contribute to color stability and hue modulation. Also found in some specialty dye systems for textiles and imaging, though hair color applications are the primary use. Requires careful handling due to potential skin sensitization in its raw form.