What is Congo Red?

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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.
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Can i get the isobestic point of Congo red?

Yes you can do it, if you do it right! . Here the small recipe for: . Use a Congo Red solution of pH 6-7 and a 1.0 cm Cuvette. . Adjust the concentration that at Lambda

What are the applications of Congo red dye?

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

What was the Red Rubber Scandal of the Belgian Congo?

Basically, King Leopold II of Belgium personally owned the Congo (so at this point it wasn't actually the "Belgian Congo", it was called, ironically, the "Belgian Free State")

Congo Red Cream and Distilled Water?

The combination of Congo red cream and distilled water is used forstaining cells for viewing under the microscope. Staining make theindividual cells much easier to see.