: a dye used chiefly in the form of its sulfate as a biological stain (as for staining neutral fat red in the presence of dilute sulfuric acid)
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“Nile blue.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Nile%20blue. Accessed 3 Nov. 2025.
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