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Close your eyes and think for a moment a self-erasing documents! Xerox researchers have developed an experimental printing technology that could someday replace printed pages that are used for just a brief time.That would be a prints whose images last only a day, so that the paper can be used again and again. "The technology, which is still in a preliminary state, blurs the line between paper documents and digital displays and could ultimately lead to a significant reduction in paper use."