Used primarily in hair dye formulations, this compound acts as a coupler that reacts with other dye intermediates to produce a range of permanent, natural-looking hair colors. It contributes to color intensity and longevity, especially in shades like black, brown, and blue. Due to its small molecular size, it penetrates the hair shaft effectively during the oxidative dyeing process. Also found in some textile dyes for synthetic fibers, where it helps achieve uniform and stable coloration. Its sulfate salt form improves solubility and stability in aqueous solutions, making it suitable for liquid and cream-based products.