SHANGHAI YONGLONG CHEM-TECH Co.,Ltd was invested one hundred and twenty million. The company has passed the ISO 9001-2000 international quality control authorization and its some products were firstly authorized with TUV in German among the rivals. We are insisting on researching, developing and producing special fine chemicals since SHANGHAI YONGLONG CHEM-TECH Co.,Ltd was founded. We produce and sell six ranges of the following products: high quality acid dyes, dye intermediates, pharmaceutic...