Counterstain
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A counterstain is a stain with colour contrasting to the principal stain, making the stained structure easily visible using a microscope.
Gram-positive anthrax bacteria with counterstained white blood cells
Safranin
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Safranin is a biological stain used in histology and cytology. Safranin is used as a counterstain in some staining protocols, colouring cell nuclei red. This is the classic counterstain in both Gram s
Sample of Safranin O
Safranin O in aqueous solution