Naphthalene-1,2-diamine dihydrochloride is primarily used in the synthesis of dyes and pigments, particularly in the production of azo dyes, which are widely employed in the textile, paper, and leather industries. Its role as an intermediate in organic synthesis makes it valuable for creating complex chemical structures. Additionally, it finds application in analytical chemistry as a reagent for detecting and quantifying specific compounds. In research, it is utilized in the development of fluorescent probes and other specialized chemicals for studying biological systems. Its ability to form stable complexes also makes it useful in certain catalytic processes and material science applications.