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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
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