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Carta with IR touch rather than capacitive seems to be the best white without frontlighting. Possibly best contrast.
Transreflective screens are only good for artificial built in light and bright sunlight. Inherently an LCD technology as it traditionally uses a rear light source or on small screens a mirror. The eink is opaque, though as I suspected, the rear has a dimmer negative image, so the white parts of the top can't have light reflected from a rear mirror as the rear will have the black particles. The white is no doubt the milky liquid.
Transreflective screens are really old and used on phones and PDAs originally.
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