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Even if in one capsule, the only way to use CYM + black/white is in layers.
But inherently the true primary colours and tertiary colours will be darker than Cyan, Yellow or Magenta.
And Cyan, Yellow or Magenta if perfect are each 2/3rds as bright as white. It's basic physics. Obviously coloured pigments are not as bright as perfect unless they have fluorescent compounds.
It's significant, IMO, that the E Ink company only mentions Retail, Signage etc, and not coloured ereaders. It's very slow and poor brightness without a front light. Indoor Retail display can use mains. Outdoor facing windows will have daylight brighter than most indoor reading ambient light.
Gallery 3 appears to be speeding up Gallery Plus (still very slow) and slightly improving brightness/contrast. It's not going to have more colours.
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