Kaycoll PK hexasodium 2,2'-[vinylenebis[(3-sulphonato-4,1-phenylene)imino[6-(diethylamino)-1,3,5-triazine-4,2-diyl]imino]]bis(benzene-1,4-disulphonate) 1,4-Benzenedisulfonic acid, 2,2'-[1,2-ethenediylbis[(3-sulfo-4,1-p henylene)imino[6-(diethylamino)-1,3,5-t riazine-4,2-diyl]imino]]bis-, sodium salt (1:6) C.I. Fluorescent Brightener 357 (83512-97-4) fluorescent brightener 357 Fluorescent Brightener 357 2,2'-(1,2-ethenediyl)bis[5-[[4-(diethylamino)-6-[(2,5-disulfophenyl)amino]-1,3,5-triazin-2-yl]amino]benzenesulfonic acid] hexasodium salt Tinopal STP