Synonyms: barium 2-[(2-hydroxynaphthyl)azo]naphthalene-1,5-disulphonate;1,5-Naphthalenedisulfonic acid, 2-(2-hydroxy-1-naphthalenyl)azo-, barium salt (1:1);2-[(2-Hydroxy-1-naphthalenyl)-azo]-1,5-naphthalenedisulfonic acid, barium salt (1:1);1,5-Naphthalenedisulfonic acid, 2-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-, barium salt (1:1);Einecs 267-580-7