1716-22-9 2,7-Naphthalenedisulfonic acid, 3-((2,4-dinitrophenyl)azo)-4-hydroxy-, disodium salt 5423-07-4 C.I. 14890 Disodium 2-(2,4-dinitrophenylazo)-1-hydroxynaphthalene-3,6-disulphonate EINECS 226-549-8 NSC 9360 Nitrazine Yellow Nitrazine paper Nitrazol Yellow Phenaphthazine delta Paper, indicator