1,8-DIHYDROXY-2,7-BIS(5-CHLORO-2-HYDROXY-3-SULFOPHENYLAZO)-3,6-NAPHTHALENEDISULFONIC ACID TETRASODIUM SALT 2,7-BIS(5-CHLORO-2-HYDROXY-3-SULFOPHENYLAZO)CHROMOTROPIC ACID TETRASODIUM SALT 2,7-BIS[2-HYDROXY-3-SULFO-5-CHLOROPHENYLAZO]-1,8-DI-HYDROXY-NAPHTHALENE-3,6-DISULFONIC ACID MIXED SODIUM-CALCIUM SALT SULFOCHLOROPHENOL S SULFOCHLOROPHENOL S MIXED SODIUM-CALCIUM SALT sulfochlorophenol S mixed*sodium-calcium sulfochlorophenolssodiumsaltcrystalline 2,7-bis(2-hydroxy-3-sulfo-5-chlorophenylazo)-1,8-di-hydroxynaphthalene-3,6-disulfonic acid