N,N-Diethyl-p-phenylenediamine sulfate salt is widely utilized in research focused on:

• Colorimetric Analysis: This compound is commonly used in colorimetric assays to detect and quantify various substances, such as nitrites and nitrates in water samples, providing a simple and effective method for environmental monitoring.
• Textile Industry: It serves as a dye intermediate, particularly in the production of azo dyes, which are essential for coloring fabrics and textiles, offering vibrant colors and excellent fastness properties.
• Cosmetic Formulations: The compound is incorporated into cosmetic products as a colorant and antioxidant, enhancing product stability and providing appealing colors in makeup and skincare items.
• Pharmaceutical Applications: It is utilized in the synthesis of various pharmaceutical compounds, contributing to the development of medications with specific therapeutic effects, thus playing a crucial role in drug formulation.
• Research and Development: In laboratories, it is employed in various chemical reactions and studies, particularly in organic synthesis, aiding researchers in exploring new compounds and their potential applications.