C.I. Mordantred 19 Benzenesulfonic acid, 5-chloro-3-(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo-2-hydroxy-, monosodium salt Omega Chrome Red ME 5-Chloro-3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-2-hydroxy-benzenesulfonic acid, monosodium salt sodium 3-(5-hydroxy-3-methyl-1-phenylpyrazol-4-ylazo)-5-chloro-2-hydroxybenzenesulphonate Acid mordant Red 19 Chrome Red 5G Mordant Red 19