Congo red
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Congo red is an organic compound, the sodium salt of 3,3′-([1,1′-biphenyl]-4,4′-diyl)bis(4-aminonaphthalene-1-sulfonic acid). It is an azo dye. Congo red is water-soluble, yielding a red colloidal solution; its solubility is greater in organic solvents. The use of Congo red in the textile industry has long been abandoned, primarily because of its carcinogenic properties,[1] but it is still used for histological staining.
Quick Facts Names, Identifiers ...
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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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ECHA InfoCard | 100.008.509 |
MeSH | Congo+red |
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Properties | |
C32H22N6Na2O6S2 | |
Molar mass | 696.665 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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