Direct Blue 14 Chemical Name Direct Blue 14 C.I. No. 23850 CAS No. 72-57-1 Synonyms Atul Direct Blue NB-2BG, Chloramine Blue 3B, Kemanarect Blue, Niagara Blue 3B 200%, Trypan Blue, Diphenyl Blue Molecular Formula C34H24N6Na4O14S4 Molecular Weight 960.81