4-amino-5-hydroxy-3-[[4-[(2-hydroxy-6-sulpho-1-naphthyl)azo]phenyl]azo]-6-(phenylazo)naphthalene-2,7-disulphonic acid, sodium salt

4-Amino-5-hydroxy-3-[[4-[(2-hydroxy-6-sulfonaphthalene-1-yl)azo]phenyl]azo]-6-(phenylazo)-2,7-naphthalenedisulfonic acid/sodium,(1:x) salt