What is counterstain?

Counterstain is a second stain, usually of a contrasting color, applied to a microscopy specimen to color parts not affected by the first stain.

A counterstain is a stain with colour contrasting to the principal stain, making the stained structure easily visible using a microscope.
Examples include the malachite green counterstain to the fuchsine stain in the Gimenez staining technique and…

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