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eInk devices don't play nice when they get too hot, or too cold. I have seen various numbers bandied about. I am not sure what the range is for the Touch, buit some sources say the range for some eInk devices is 0-50C.
Think about that whole "hot enough to fry and egg" thing that goes on in the summer. The air temperature can be bearable, but the egg cooks anyway. It's not the light--it's the heat.
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