Direct Black BF

Direct Black 155

disodium 4-amino-3-[[4-[(2-amino-4-hydroxyphenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonate

4-Amino-3-[[4-[(2-amino-4-hydroxyphenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid disodium salt

2,7-Naphthalenedisulfonic acid, 4-amino-3-[[4-[(2-amino-4- hydroxyphenyl)azo]phenyl]azo]-5-hydroxy-6-(phenylazo )-, disodium salt