Basic information
CAS NO
573-58-0
EINECS
209-358-4
Molecular Formula
C32H22N6Na2O6S2
Molecular Weight
696.6632
English Name
Congo Red
Synonyms
C.I. 22120, C.I. Direct Red 28, C.I. Direct Red 28, disodium salt, C.I. Direct Red 28, disodium salt (8CI), Congo red, Direct Red 28, Congo red (0.1% in water)[for titration], Congo red (0.1% in water), Direct Scarlet 4B, disodium 3,3'-[biphenyl-4,4'-diyldi(E)diazene-2,1-diyl]bis(4-aminonaphthalene-1-sulfonate), disodium 4-amino-3-[4-[4-[(1-amino-4-sulfonato-2-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate, Direct Red 28
Physical and Chemical Properties
Melting point
360℃
Water Solubility
soluble
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