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Black No.401
Legal color:Black No.401  
General name:Naphthol Blue Black   
Class:Acid Dye
FDA :(D & C Black No.1)  
CI #:C.I. 20470
Color #:Acid Black 1
CAS #:1064-48-8
CAS ::2,7-Naphthalenedisulfonic acid,4-amino-5-hydroxy-3-[(4-nitrophenyl)azo]-6-(phenylazo)-,disodium salt
IUPAC:→1;Disodium 4-amino-5-hydroxy-3-(4-nitrophenylazo)-6-phenylazo-2,7-naphthalenedisulfonate
→2;4-Amino-5-hydroxy-3-(4-nitrophenylazo)-6-phenylazo-2,7-naphthalenesulfonic acid disodium salt
Chemical structure :
Naphthol Blue Black