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By programming a computer to compare the results, they can then build images that show only the original ink and none of the ink added by the monks.
ECONOMIST: The Archimedes palimpsest
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But as a back-up the Rochester researchers are also considering a magnetic technique that would be able to detect iron particles left over from the original ink, even in places where the pigment itself has faded away completely.
ECONOMIST: The Archimedes palimpsest
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In its former incarnation as a division of Phillips, iRex developed the original E-Ink display that was eventually licensed to Amazon and Sony.
FORBES: Magazine Article