... the fabric of cotton fiber, nylon, etc, taking on excellent whitening effect on artificial fiber, polyamide, vinylon, International authenticationISO9001,BV etc ... industry and 0.1-0.3% in dyeing industry.FLUORESCENT WHITENING AGENT CXT,Optical Brighteners,WHITENING AGENT CXT FLUORESCENT WHITENING AGENT CXT,Optical Brighteners,WHITENING AGENT CXT