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I haven't had this issue with my 505. My 600 though did exactly show such speckles when I was reading outside last weekend. Usually I read at home or at the office at around 75F. Outside last weekend we had only around 51F in the sun. I thought that the little eink dots reacted a little dull. I also had more shadowing from previous pages when turning the pages. This all stopped once the reader was at regular room temperature again.
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