Patent Blue VColour Shade Synonyms Food Blue - 5Chemical Name Sodium Salt of [4-a-[4-(Diethylamino)-5'-Hydroxy-2', 4'-Disulphonatobenzhydrylidene] Cyclohexa-2, 5-Dien-1-Ylidene]Diethyl Ammonium Hydroxide Inner saltC.I. No 42051C.I. Name Acid Blue - 3FDA Status ---CAS No. 20262-76-4EINECS No. 222-573-8E. NUMBER E-131