Direct Blue 310

trisodium 4-hydroxy-3-[[4'-[(1-hydroxy-4-sulphonato-2-naphthyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulphonate C.I. Direct blue 38, trisodium salt 5-Chloro-4-hydroxy-3-[[4'-[(1-hydroxy-4-sulfo-2-naphtyl)azo]-3,3'-dimethoxy-1,1'-biphenyl-4-yl]azo]-2,7-naphthalenedisulfonic acid trisodium salt 2,7-Naphthalenedisulfonic acid, 4-amino-6-[[4'-[(8-amino-1-hydroxy-5-sulfo-2-naphthalenyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-5-hydroxy-3-[(2-methyl-5-nitrophenyl)azo]-, trisodium salt C.I. Direct Blue 33

Direct Blue 312 1'-Hydroxy-4-[[4-[(1-hydroxy-4-sodiosulfo-2-naphthalenyl)azo]-7-sodiosulfo-1-naphthalenyl]azo]-6'-phenylamino[1,2'-azobisnaphthalene]-3',7-disulfonic acid disodium salt 2,7-Naphthalenedisulfonic acid, 3,3'-[(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-chloro-4-hydroxy-, tetrasodium salt Direct Blue 311