... %Residue in water ≤0.5%Fineness(remains through 180mm mesh) ≤10%Application:1.Whitening agent for cotton fabric and gluing products ... place,stored term shouldn't exceed 2 years.Fluorescent Brightener VBL,Whitening Agent VBL,Optical brightener Fluorescent Brightener VBL,Whitening Agent VBL,Optical brightener