1.fluorescent optical Brightener for Cotton 4BK (c.i. 113)2.be used as brightener of contton, linen, silk, polyamide fiber ,wool Chemical ... proper amount leveling agent according to the leveling effect).2. Padding Process: 4BI:0.5-5g/l, residue liquor ratio:100 ... -2 minUse:Mainly be used as brightener of contton, linen, silk, polyamide fiber ,wool and paper.Package:It is packed in ...