Haematoxylin
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Haematoxylin is extracted from the wood of the logwood tree. When oxidised it turns a rich blue-purple colour and is used, together with a suitable mordant, to stain cell nuclei prior to examination under a microscope.
Haematoxylin and eosin stain is one of the most commonly used stains in histology.
See also: staining (biology)Template:Biosci-stub