Widely used in the hair dye industry as a primary intermediate for permanent hair coloring. It forms the base for oxidative hair dyes, reacting with couplers to produce a range of shades. In the textile industry, it serves as a dye intermediate for synthetic fibers like nylon and polyester. Additionally, it is utilized in the production of rubber antioxidants and accelerators, enhancing the durability and performance of rubber products. Its application extends to photography as a developing agent for black-and-white films.