Here’s a video of an electric BMW that can literally change the color of its paint job with the press of a button. We still don’t know how it works.
BMW Shows Off Car That Changes Color at the “Touch of a Button”
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The surface coating of the BMW iX Flow featuring E Ink contains many millions of microcapsules, with a diameter equivalent to the thickness of a human hair. Each of these microcapsules contains negatively charged white pigments and positively charged black pigments. Depending on the chosen setting, stimulation by means of an electrical field causes either the white or the black pigments to collect at the surface of the microcapsule, giving the car body the desired shade.