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Colour eInk displays are probably several years away from commercial production. They have, I believe, only reached the "technology demonstration" stage at present.
Remember too that a colour device has inherently only 1/3 the resolution of an equivalent B&W device, because you need three pixels (R,G,B) in place of one. For applications such as reading eBooks, personally I'd rather have the existing eInk technology rather than a colour one with 1/3 the resolution.
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