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Oh, and the Kindle Voyage was released on November 4, 2014, in the U.S. It has a 6-inch, 300 ppi E Ink Carta HD display, which was the highest resolution and contrast available in e-readers, as of 2014.
That will be 10 years ago this autumn. The Kaleido is simply a 2 x 2 pattern of coloured dots (about 4 years ago) because Triton (nearly 14 years ago!) was 3 x 1 like most LCD (some are 2 x 2) was too dark and also the mono pixels were square unlike 1/3rd width LCD mono pixels for colour stripes.
There could easily have been a Kaleido colour eink in 2014. It's only a dot pattern on a regular eink display.
Improvements in eink have been marginal since 2014. The 300 dpi is not yet exceeded, and larger panels have only slowly got higher resolution (Scribe is first 300 dpi over 10″). The larger panels are not yet 300 dpi.
ACeP is a different principle, in theory better than Kaleido for eink, but it seems doomed to very niche adverts due to being very slow. It's about EIGHT years old and getting no better.
Spectra can be seen in the supermarkets. White, red and black. Price tags seems to be biggest growth for eink. Quite low resolution, no power except from controller when updating. Larger panels look like mono Pearl. Aldi, Lidl and Musgraves (Supervalue, Centra etc).
Having had a reMarkable and still having a DXG (9.7″ Pearl) and Elispa (10.3″) I'm now of the conclusion that only mono eink is worth while and only up to 8″ (mostly novels), though maybe an 8.5″ to 9″ might be plausible. I tried the original (or near original) Sony in about 2006 and have had eink since 2013 and for ambient light reading a novel in mono it's excellent. I seriously consider large Sony DPT, Fujitsu etc and decided too limited for PDF. I got the Elipsa and within a month had 100% switched to a Sage. I gave away the reMarkable and no-one I know with an ereader wants the Elipsa, even free. Too big for novels and not good enough for PDFs.
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