Used in hair dye formulations as a coupler to produce a range of natural-looking shades, especially brown and black tones. It reacts with primary intermediates like p-phenylenediamine in oxidative dyes to form larger colored molecules within the hair shaft. Its methoxy group helps improve color fastness and stability. Also found in some photographic developers and dye synthesis processes due to its electron-donating properties. Limited use in pharmaceuticals as an intermediate in the production of certain aromatic amines.