Widely used in hair dye formulations due to its ability to penetrate the hair shaft and produce long-lasting color through oxidation. It is a key ingredient in permanent and semi-permanent hair color products, contributing to dark and rich shades, especially black and brown tones. Also employed in the production of dyes and pigments for textiles, providing color fastness and stability. Used in the manufacturing of certain polymers and resins, particularly in the development of high-performance materials such as aramid fibers, which are valued for their strength and heat resistance. Commonly found in some printing inks and photographic chemicals, where it acts as a developing agent. Additionally, it has limited use in rubber processing as a curing agent or antioxidant. Due to its sensitizing potential, handling requires caution, especially in consumer products, as it can cause allergic reactions in susceptible individuals.