Harris hematoxylin stain and hematoxylin stain are similar but not exactly the same. Harris hematoxylin is a refined version of the traditional hematoxylin stain, providing more consistent and enhanced staining results. Papanicolaou stain includes Harris hematoxylin, while H&E stain traditionally includes a hematoxylin stain.

The most common histology stain used for brain tissue is hematoxylin and eosin (H&E) staining. This stain allows for visualization of the overall tissue architecture, cell morphology, and distinguishing between different cell types in the brain. Other stains like Nissl stain can be used to highlight neuronal cell bodies and their distribution in the brain.

If you are talking about a Gram Stain, then red. E. coli is Gram negative which means that Safranin will stain it red during a gram stain.

A common chemical used to make specimens visible under a microscope is a stain, such as hematoxylin and eosin (H&E) stain. Stains are designed to highlight specific structures or components of the specimen by adding color contrast.

It depends on the type of stain used. H&E stain, stains nuclei and granules blue and other eosinophilic structures as red, pink, or orange. CV stains produce a purple color. Eosin produes red.