Direct Blue 49
C.I. Direct blue 49
C.I.Direct Blue 49:C.I.22540
2,7-Naphthalenedisulfonic acid, 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(4,5-dihydroxy-, tetrasodium salt
4-(4-Aminophenyl)benzenamine double nitriding, and 4,5-Dihydroxynaphthalene-2,7-disulfonic acid (2 Moore) coupled.
Properties and Applications
dark red light blue and red light navy. Soluble in water for deep purple, soluble in ethanol for purple. The strong sulfuric acid for green light blue, for purple diluted. The dye solution to join strong hydrochloric acid for deep blue purple; Add sodium hydroxide solution for dark purple.
