Formerly Wenzhou Longwan Dye Intermediate Factory established 1992, our company was incorporated in 1999 with the name of Wenzhou Longsheng Chemical Co., Ltd. , keeping pace with the continuous development of new products and progressive increase of our market-occupying rate. On the basis of technical support of domestically famous research institute and cooperation with relevant foreign companies, we have been manufacturing dye intermediates and the heat sensitive pigments applied to carbonle...