The C.I. Acid Yellow 128 , with the CAS register number 51053-43-1, has other names as acid yellow 128 ; neuter yellow gl ; polfalan yellow gl ; polfalan yellow pa-gl ; youhaoneuter yellow gl . Its chemical formular is C16H16N4O5S, with sixteen carton, sixteen hydorgen, four nitrogen, five oxygen and one sulphur.

It is a kind of yellowish-brown powder and is light yellow gel-like in the water solvent but yellow in concentrated sulfuric acid, turning to light yellow solvent after diluting. Besides, it will not change the color in concentrated hydrochloric acid, turning into light yellow solvent after diluting.

This chemical is mainly used in dyeing of the wool, silk and nylon in neutral and faintly acid dye bath and in the dyeing of vinylon in neutral acid dye bath, in direct printing of wool, silk and nylon cloth. Besides, it could also be used in the leather dyeding. Its raw materials are including the following, Cobalt chloride, Acetoacetanilide, 3-Amino-4-hydroxybenzenesulphonamide.

As to its production method, prepare the raw material of C6H8N2O3S and acetanilide, firstly diazotize the former, and couple with the latter, then filter after complexing the cobalt chloride and finally get the products.

As for its market information, you could find many suppliers in China, such as Ningbo Dynasty Chemical Co., Ltd , Nanjing Chemlin Chemical Co., Ltd , and Qingdao Double-peach (QDP) Specialty Chemicals (Group) Co.Ltd .