Funan chemical industrial co. ltd, Quzhou, Hebei, is a professional factory, which series dyeintermediates. The products have been sent to many users in Shandong, Jiangsu, Zhejiang, Shanghai, and enjoy high reputation.The 1,4,5,8-----Naphthalene-tetra-carboxylic acid which are acylized have high content of second anhydride, it could make the dye firmer, better the color and light.