Tags: Chemical Compound, Chemical Substance.

Congo red is the sodium salt of 33′-([11′-biphenyl]-44′-diyl)bis(4-aminonaphthalene-1-sulfonic acid)(formula: C32H22N6Na2O6S2; molecular weight: 696.66 g/mol). It is a secondary diazo dye. Congo red is water soluble yielding a red colloidal solution; its solubility is better in organic solvents such as ethanol.It has a strong though apparently non-covalent affinity to cellulose fibers.

Congo-red-2D-skeletal.png
IUPAC name
disodium 4-amino-3-[4-[4-(1-amino-4-sulfonato-naphthalen-2-yl)diazenylphenyl]phenyl]diazenyl-naphthalene-1-sulfonate

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