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Derived from a shrubby tree, this humble nuclear stain was the partial cause of not just one war but two between Britain and Spain; the development of the country of Belize; and the rapid growth of the textile industry in 18th-century Europe.
The fact that this visible nuclear stain can also be washed out after 48 hours and the same cells can be re-stained over time is also very novel.
A Toluidine Blue is a nuclear stain commonly used in cytopathology to determine the cellularity of body cavity fluids and to search for abnormal cells.