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Short response: Colour eink is pointless for reading novels.
Longer answer: This is why it's only for comics and signage.
Colour eink needs a front light except outdoors. There are two basic technologies:
1: The filter kind (Triton, Kaleido) is either dark or pastel and about 4000 shades/hues with reduced resolution. OK for comic books outdoors. It's mono eink with an RGB filter on top, so either you get full resolution in one axis and one third on the other axis, or you have half resolution on both axis. The filter may gradually fade in bright sunlight (the ones on LCD panels do).
2: The coloured cell kind (Gallery Acep) is up to 1.5 seconds to turn a page and about 30,000 shades/hues (in slowest mode). Really for shop signage. It's got an unpleasant flicker turning a page. Page turning takes a lot more power. Each pixel or cell is somehow cyan, yellow, magenta and Black/white, but there is no clear explanation anywhere.
All current decent LCD / OLED/LED do about 16 Million shades/hues, HDR even more.
The mono eink has Black, White and 14 greys. Page turn speed is maybe slightly better than manually turning a paper page.
The mono is perfectly fine for reading novels as eBooks. Colour of either kind eink is not.
There was Mirasol, which is fast and coloured. Qualcomm own it. The exact reasons for its demise over 10 years ago is unclear, One model of ereader was made and sold under two Chinese brands.
I'd never buy a colour eink unless it was some new better CYMK layer technolgy not yet even invented that didn't need extra lighting.
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