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.
disolve 0.5g congo red in 90ml distilled water and 10ml achohol absolute
495
Basic dyes: Crystal violet, Methylene blue, Malachite green, Safranin. Acidic dyes: Nigrosin, Congo red
changes to violet in basic solution
We think it is about 4, based on the lab we just did, but sometimes we make mistakes!
orange and purple will make red that can replace the congo red dye..
when congo red was mixed with milk it produced pink color solution.
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.
Yes.
red country
disolve 0.5g congo red in 90ml distilled water and 10ml achohol absolute
I own one actually. The difference between Congo’s and Timneh’s are that Congo’s have a red tail and are slightly bigger. I own a Congo.
red and green
There is no change in litmus paper, phenophthalein turns yellow, and congo red changes to orange..
since the unboiled yeast is alive it will not allow the congo red to be absorbed and the boiled yeast is dead so it doesnt have any way to fight of the solution(congo red)
green, yellow, red
Green,yellow,and red.