Aniline 2.5-Disulphonic Acid is an organic chemical compound commonly used as an intermediate in the production of dyes, pigments, and pharmaceuticals. It contains two sulfonic acid groups attached to an aniline structure at the 2 and 5 positions. Its primary application is in the synthesis of azo dyes, where it helps impart specific color properties. It is also used in the manufacture of other chemicals and intermediates in the dyeing industry.