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Q: What is a Congo red stain?
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What are the materials used in capsule stain?

For the capsule stain Congo red or a Nigrosin solution can be used. Next, Maneval's stain is used.


If Congo red is used instead of safranin in the gram stain technique what would happen?

armagheddon


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.


Which of the following is an example of an acidic stain?

Basic dyes: Crystal violet, Methylene blue, Malachite green, Safranin. Acidic dyes: Nigrosin, Congo red


What is the correct stain to use on stomach fat biopsy or bone marrow biopsy to diagnose Amyloidosis?

Congo Red Stain, NOT WRIGHT STAIN, is the most definitive way to diagnose it. You can find that information on the Mayo Clinic website. Also, if anyone watced the HOUSE t.v. show in September 2006, you probably remember that they used Congo Red Stain to diagnose Amyloidosis for a male patient.


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 negatively charged, so it is repelled by the negatively charged cytoplasm, and gathers around the cell wall instead, leaving the cell clear and unstained.


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.


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 the reaction of milk with Congo red?

when congo red was mixed with milk it produced pink color solution.


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.


How do you clean red stain from carpet?

Really depends on what type of red stain. Cleaning procedures are different for red dye or red wine for example.


Is Congo red autoclavable?

Yes.