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4,4-Diamino Diphenylamine-2-Sulphonic Acid DASDA is an organic compound appearing typically as a grey to off-white crystalline powder. It is extensively used as an intermediate in the synthesis of azo dyes and optical brightening agents. These dyes and brighteners are widely used in the textile, leather, paper, detergent, and ink industries. Known for its high purity and effectiveness, DASDA significantly improves dye fastness and brightness, making it an essential chemical in dye manufacturing processes. Synonyms DASDA ; 4,4′-Diaminodiphenylamine-2-sulfonic acid ; DDS Acid ; DDS Acid ; 4,4′-Diaminodiphenylamine-2-sulphonic acid Formula C₁₂H₁₃N₃O₃S CAS No 615-50-9 HS Code 29215990 Industries We Serve Dyes & Pigments Industry Textile Industry Leather Industry Printing Inks Chemical Industry Applications Key intermediate for synthesis of azo dyes and fluorescent brightening agents (optical brighteners). Essential in producing dyes for the textile, leather, and paper industries. Used to produce direct, acid, and reactive dyes with high stability, brightness, and excellent wash fastness. Integral intermediate in acid dye production to impart rich and even colorations on leather goods. Primary intermediate in producing optical brighteners used in paper, textile, and detergent industries. Intermediate in the manufacturing of colorants and pigments for specialized inks and surface coatings.