We, HEBEI XINGYU CHEMICAL CO.,LTD. is a leading manufacturer of series of Basic dyes and Optical brighteners for more than twenty years. Optical brighteners such as OPTICAL BRIGHTENER OB(FBA 184),OPTICAL BRIGHTENER OB-1(FBA 393),OPTICAL BRIGHTENER FP-127(FBA 378),OPTICAL BRIGHTENER KCB(FBA 367),OPTICAL BRIGHTENER CBS-X(FBA 351),OPTICAL BRIGHTENER KSN (FBA 368) which are mainly used in thermoplastics,resin,fibers,paints,printing ink,detergent,washing liquid,soap etc. skype:kettyyang