Phosphotungstic acid haematoxylin is a mix of haematoxylin with phosphotungstic acid, used in histology for staining.
Phosphotungstic acid-haematoxylin staining demonstrating contraction band necrosis in an individual who had a myocardial infarction (heart attack).
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