Courtesy of Amanda Slater, Wikimedia Commons

««« By James Palcik

A solution is prepared containing a dye. The dye, methylene blue, is colourless in a reduced state. Upon shaking the solution, the dye is oxidized and displays a blue colour. As the solution stands undisturbed, the dye fades to colourless as it is reduced. The cycle may be repeated over and over.
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