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If my memory serves me right gray levels are achieved by partly rotating bi colored particles.
Putting multiple colo(u)rs on the same particle would defeat the whole concept of colo(u)r displaying because each colo(u) has to be dosed grayscale style to work effectively; making this thought next to impractical.
An other concept against multiple colo(u)r particles is that if you think at it closely again, when a bicolored particle displays a gray tone it is rotated partly upwards ie. if a colo(u)r particle was there instead, it would show.
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