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Nile blue

Nile blue (or Nile blue A) is a stain used in biology and histology. It may be used with live or fixed cells, and imparts a blue colour to cell nuclei.

It may also be used in conjunction with fluorescence microscopy to stain for the presence of polyhydroxybutyrate granules in prokaryotic or eukaryotic cells. Boiling a solution of Nile blue with sulfuric acid produces Nile red (Nile blue oxazone).

Usage examples of "nile blue".

He swirled a glass of after-dinner brandy, his eyes sweeping over her, resting for a moment on her hair shimmering on the shoulders of her Nile blue dress.