2,7-naphthalenedisulfonicacid,3,6-bis[(4-chloro-2-phosphonophenyl)azo]-4,5-di ;hydroxy- ;BIS(4-CHLORO-2-PHOSPHONOBENZOLAZO)CHROMO-TROPIC ACID;CHLOROPHOSPHONAZO III;3,6-bis[(4-chloro-2-phosphonophenyl)azo]-4,5-dihydroxynaphthalene-2,7-disulphonic acid ;CHLORPHOSPHONAZO III, HIGH GRADE;2,7-Bis(4-chloro-2-phosphonophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulfonicacid,disodiumsalt;dichlorophosphonoazo III