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THE CAPSULE STAIN. The capsule is a thick polysaccharide layer around the outside of the cell. It is nonionic, so. the dyes that we commonly use will not bind to it. Two dyes, one acidic and one basic, are. used to stain the background and the cell wall, respectively. The area between the 2 dyes is. the halo of the capsule surrounding the cell.
It is a procedure to stain the bacterial capsule to study its presence and also morphology for this the following steps are performed : < br / > < br / > Place a drop of Congo red on one end of the slide < br / > Aseptically pick up a sample from a culture with your loop and mix briefly with the Congo red stain. < br / > Spread the mixture across ...