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For me it is not a function of how long the device is on as I can read for several hours with no contrast loss; but rather that when left on a single page that it starts to lose contrast. I remember that the device refreshes the page when it is first displayed and does not readdress the screen again until another page request is received or the unit is turned off. What seems to happen is that some of the black "pigments" exchange with the white "pigments" over time when left alone and reduce the contrast.
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