1-Naphthylamine hydrochloride is primarily used in the synthesis of azo dyes, which are widely employed in the textile industry for coloring fabrics. It serves as an intermediate in the production of these dyes, contributing to the vibrant and long-lasting colors seen in various textiles. Additionally, it is utilized in the manufacture of certain rubber chemicals, where it acts as an antioxidant and antiozonant, helping to extend the lifespan of rubber products by protecting them from degradation caused by oxygen and ozone exposure. In research, it is sometimes used as a reagent in organic synthesis and analytical chemistry for the detection and quantification of specific compounds. Its applications also extend to the field of photography, where it is involved in the development of certain photographic chemicals.