Used in the synthesis of hair dyes and cosmetic colorants, this compound acts as a coupler in oxidative dye formulations. It reacts with primary intermediates like p-phenylenediamines in the presence of hydrogen peroxide to form larger colored molecules, producing a range of natural-looking hair shades. Its structure allows for fine-tuning of hue and intensity, making it valuable in permanent and semi-permanent hair dye products. Additionally, it contributes to dye stability and color fastness, improving the longevity of the hair color. The presence of the hemihydrate form can influence solubility and processing characteristics in aqueous formulations.