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 ER-1(FBA 199),

OPTICAL BRIGHTENER ER-11(FBA 199:1)

OPTICAL BRIGHTENER KSN (FBA 368)

which are mainly used in thermoplastics,resin,fibers,paints,printing ink,detergent,washing liquid,soap etc.