Hangzhou Colorific Chemicals Co., Ltd-a supplier …
Hangzhou Colorific Chemicals Co., Ltd— a supplier of top-grade dye intermediates, including pyrrolidone series, benzene series and naphthalene series, 2-Chloro-4-nitroaniline, 4'-Aminoazobenzene-4-sulphonic acid,2-Pyrrolidinone,N-octyl-2-Pyrrolidinone