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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 do you do with eosin?
Perhaps the most common use of eosin dye is in blood testing. Technicians mix the dye with a small amount of blood, then count how many cells absorb the fluorescent red dye. Several serious diseases cause a count of more than 500 eosinophils/microlitre of blood.
Nation west of Congo?
Angola and Zambia are both South of Congo
How can you use indigo in a sentence?
The rocks in the canyon have varying hues of red, and tan, and indigo. The indigo plant was widely use to make a blue clothing dye.
What happens when you put dye in water?
If you boil it, the water will boil and the dye will not, leaving you with dye.
Why is a red shirt red?
Red paint is red because it contains red dyes. Dyes are pigments that absorb all the colors in white like except the color they reflect. Thus a red dye absorbs all colours in white light except red. Light coming off it therefore looks red.
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 lambda max for Congo red dye adsorption?
The lambda max for Congo red dye adsorption typically lies around 497-498 nm, which represents the wavelength at which the dye molecule absorbs light most strongly. This specific wavelength can be used to monitor the adsorption process of Congo red dye onto different surfaces or materials.
What is another example of a acidic dye besides Congo red?
Nigrosin
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.
What is Congo red stock solution?
Congo red stock solution is a dye solution primarily used in histology and microbiology for staining purposes. It is particularly known for its ability to bind to amyloid proteins, making it useful in the diagnosis of amyloidosis. The solution is typically prepared by dissolving Congo red powder in a suitable buffer or solvent, such as distilled water or ethanol, to achieve a specific concentration. In addition to its staining applications, Congo red has also been used in various biochemical assays.
Congo Red Cream and Distilled Water?
Congo Red is a dye commonly used in histology to stain cellulose fibers and amyloid proteins red. It is typically prepared as a concentrated solution in distilled water for staining purposes. The cream form may refer to a topical formulation of Congo Red for research or diagnostic purposes.
Acidic Congo red does not contain carbon particles like Nigrosin but can give the appearance of a negative stain What is the basis for this stain?
Acidic Congo red is a negatively charged dye that can stain the background of a specimen, giving the appearance of a negative stain. This effect is due to the electrostatic repulsion between the negative charge of the dye and the negatively charged cellular components, causing the dye to be excluded from the cells and stain the background instead.
What is Congo Red?
Congo red is the sodium salt of benzidinediazo-bis-1-naphtylamine-4-sulfonic acid (formula: C32H22N6Na2O6S2). 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 fibres. However, the use of Congo red in the cellulose industries (cotton textile, wood pulp & paper) has long been abandoned, mainly because of its toxicity.Conga Red is an acidic stain primarily used to stain bacterial cells to test for capsules. The Conga Red stain is used to stain a microscope slide background against the colorless cell. Then a basic stain like Maneval's Stain is used to stain the cell. The capsule surrounding some cells will repel the stains and appear colorless against a red (Conga Red) background. The cell inside the capsule will be stained light purple from the Maneval's Stain.
What is the difference between Metachromasia and the stain Congo red?
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.
How do you make purple dye?
mix red and blue dye Red dye- redberries blue dye- woad leaves
How do you get orange dye in RuneScape?
use a red dye on a yellow dye to get orange dye
How do you remove red dye from white jeans?
bleach the red dye out.
