I suspect plastic beads. No rotation in the kindle eink, though other eink tech does have rotating bi-color beads. Some eink uses one color of charged particles in colored oil. But the kindles use the eink tech shown in the video below (with both black and white particles):
What I have not been able to wrap my mind around is how new the ACeP multicolor eink works:
http://the-digital-reader.com/2016/0...aper-displays/
Quote:
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This wholly-new epaper does away with the color filter required for previous color epaper screens and instead displays a full color gamut, including all eight primary colors, using only colored pigments in each pixel.
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Umm... What color space has EIGHT primary colors?