Funan chemical industrial co. ltd is a professional factory, which series dyeintermediates. The products have been sent to many users in Jiangsu, Zhejiang, Shanghai, and enjoy high reputation.The 1,4,5,8-naphthalenetetracarboxylic acid which are acylized have high content of second anhydride, it could make the dye firmer, better the color and light,increase the harvest, win the consumers'praise.