Used primarily in the dye industry, it serves as an intermediate in the synthesis of azo dyes, which are widely applied in textiles, leather, and paper coloring. Its sulfate form enhances solubility, making it easier to handle in aqueous dye formulations. Additionally, it plays a role in the production of hair dyes and pigments due to its ability to form stable, vibrant colors. In research, it is utilized as a reagent in organic synthesis and analytical chemistry for studying reaction mechanisms and developing new chemical compounds. Its applications are driven by its reactivity and ability to introduce nitro and amino groups into various chemical structures.