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I would be surprised to see color e-ink screens. They seem to be expensive to develop and with more and more people buying tablets, it might be deemed too expensive to create a color e-ink screen. Most books are written using black and white text so color is not really needed.
Text books and the like could use color but I see those on tablets like the Fire, Nook Tablet, Vox, and IPad then I do an e-reader. The tablets have color and tned to have larger screens and interactive options that are going to be useful for a textbook.
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