I have two K4 - a silver one from 2011 and a black one, purchased 2013. The silver one which I actually used longer (it was my only e-reader for two years) is not faded at all. The black one (I read almost exclusively on it for 1,5 years or so) seems a bit faded when the page refresh is off (it refreshes every 6 pages then). The Basic Kindle from 2014 (with touchscreen) is also not faded at all, but I have not used it very much.
I have never taken any of my readers out of the house or read in direct sunlight.
So it seems that the 2012 black Basic is indeed somewhat prone to fading.
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