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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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