Aniline 25- Disulphonic Acid is used as suitable intermediate for direct dyes. Available in white crystalline form, this substance has standard shelf life. Its molar mass is 253. Apart from dye intermediate, it is used as optical whitening agent. Melting point of Aniline 25- Disulphonic Acid is more than 300 degree C. Processed under controlled temperature, this substance has gone through different types of quality checking procedures to prove its standard quality. Long storage life, accurate composition and non toxic content are its key features.