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What I meant about cells with different colored particles, btw, was that in one cell there would be white particles and magenta particles, in another white and yellow, in another white and cyan, and in another white and black (the current mode). The cells would be grouped together in blocks, and each block would represent one pixel. You'd need the equivalent of 2x the DPI you want (since DPI is measured linearly), and manufacturing adacent cells with different colored particles would likely not be possible using the current process. But the result would be similar to current 4-color printing on paper.
If the cell method of white particles in black oil were modified, you'd need 4 colors of oil in adjacent cells, which would be at least as difficult, if not more so, than 4 different colors of particles in adjacent cells.
Two-sided particles in white and 4 different colors would probably be equally difficult to manufacture.
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