Established in 1999, Zhengzhou Siwei (group) Co., Ltd. is an integrated organization with strong R&D, engineering, and manufacturing capability specialized in specialty chemicals, material sciences and grain& oil derived products. Siwei Specialty chemicals and material science division is fully focused on the R&D and commercial manufacturing of leuco dyes/color formers and dye intermediates. We currently offer products such as OBD-1, OBD-2, S-205, 2-(4-Diethylamino-2-Hydroxybenzoyl)Benzoic Acid (Ethyl keto acid); 2--(4-(dibutylamino)-2-hydroxybenzoyl)-benzoic acid (BBA, butyl keto acid) and 3-Diethylaminophenol (m-Diethylaminophenol) etc. on commercial scale. With over 500 dedicated full time employees we are committed to supply our customers with highest quality products and service to enable your success!