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Answered 2011-09-13 19:51:53
Congo red dye is a synthetic reactive water soluble dye:
� used in medicine (as a biological stain)
� and as an indicator since it turns from red-brown (in basic medium) to blue in acidic one.
� It is also used to color textiles (initially cotton).
� It could also be used as a gamma-ray dosimeter since its coloration decays with the intensity of the irradiation [E-Journal of Chemistry, http://www.e-journals.net Vol. 5, No.3, pp. 572-576, July 2008].
It is carcinogenic [Adsorptive removal of Congo red, a carcinogenic textile dye by chitosan. hydrobeads: Binding mechanism, equilibrium and kinetics, Colloids and Surfaces A: Physicochem. Eng. Aspects 299 (2007) 146 152].
Congo red contains an azo (-N=N-) chromophore and an acidic auxochrome (sulfonate : -SO3H) (which, respectively, gives and reinforces the coloration) associated with the benzene structure. Congo red is a the sodium salt of a derivative of benzidine and naphthionic acid.
About the formula, See Congo-red-2D-skeletal.png in wikipedia.
See also Encyclopaedia Britannica.
Congo red dye is a synthetic reactive water soluble dye:
¤ used in medicine (as a biological stain)
¤ and as an indicator since it turns from red-brown (in basic medium) to blue in acidic one.
¤ It is also used to color textiles (initially cotton).
¤ It could also be used as a gamma-ray dosimeter since its coloration decays with the intensity of the irradiation [E-Journal of Chemistry, http://www.e-journals.net Vol. 5, No.3, pp. 572-576, July 2008].
It is carcinogenic [Adsorptive removal of Congo red, a carcinogenic textile dye by chitosan. hydrobeads: Binding mechanism, equilibrium and kinetics, Colloids and Surfaces A: Physicochem. Eng. Aspects 299 (2007) 146-152].
Congo red contains an azo (-N=N-) chromophore and an acidic auxochrome (sulfonate : -SO3H) (which, respectively, gives and reinforces the coloration) associated with the benzene structure. Congo red is a the sodium salt of a derivative of benzidine and naphthionic acid.
About the formula, See Congo-red-2D-skeletal.png in wikipedia.
See also Encyclopaedia Britannica.
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What can be used in place of Congo red dye?
orange and purple will make red that can replace the congo red dye..
What is an example of an acidic dye?
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What ingredients are Congo Red made up of?
Congo Red is a sodium salt that has the chemical formula C32H22N6Na2O6S2. At one time, Congo Red was used as a dye for clothing but has since been abandoned due to its toxicity.
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Metachromasy is the attribute of certain dyes changing in biological tissues changing color based on the tissues involved. Congo Red is a particular dye, in a category separate from Metachromasia dyes, though it does act as a PH indicator between pH 3.0 and 5.2.
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