BRIGHTOMNI BBU-L is a Tetrasulpho type optical whitener used in Paper size press, coating and wet end applications,to achieve high whiteness and brightness properties of Paper. BRIGHTOMNI BBU-L Liquid is special Optical Brightener of medium affinity Tetra Sulpho OBA for paper. It is an innovative OBA for the WET END application in acidic to neutral media (pH 4-7). BBU-L has a broad spectrum of application and has good compatibility with Acids & Alum. Average dosage 0.2 to 6.0 g/L with size press liquor. BRIGHTOMNI BBU-L can perform with conventional Starch at the size press. Also together with CMC, PVA and anionic and slightly synthetic sizing additives. It can be a ready use optical whitener in size press. This product is used to attain moderate to high whiteness.