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Originally Posted by ottischwenk
This is not possible with current technology
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It's been possible since eink was invented, if you front light it strongly enough.
Inherently adding colour by a static means to any static reflective screen, eink or something not invented, will reduce the reflected light. On compromise is to halve the reduction by only half covering each pixel. The result is you can only have desaturated colours, i.e. pastel shades.
It's not something related to current technology, but inherent to ANY bistable screen that's inherently monochrome. There are two technologies that aren't eink that can do static colour, one uses little sacs and the other is Mirasol, which did make it into one screen in two ereaders. Both seem to be failures.