Methylene Blue Dye
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Methylene Blue Dye Concentrated dye powder used for staining DNA. Dilute with 4 liters (or a gallon) of water to make a strong dark dye. Used for staining microscope speciments to show the nucleus, or to stain DNA in gel electrophoresis to show the banding (DNA fingerprinting, or DNA barcoding). Also has fun uses in chemistry as a dissolved oxygen indicator.