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Even under optimum conditions I think there will always be a really slight ghost of the previous page. If I really look closely I can always see a faint "negative" of the previous page's text. I think this is because some readers, like the Sony, don't do the complete black -> complete white -> display text when each page is turned, in order to make the page turning snappier. On the kobo, which does do this, the page turning is very slow, but there is zero ghosting.
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