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Series of Researches on Asian Materialsand reused time and time again by erasing the letters written on it. Such parchment is called palimpsest and was first researched in Europe about two centuries ago, when it came into the spotlight, since letters which (must have) been erased emerged between the lines of parchment. The group of letters includes tales seen by humans for the first time ever. Meanwhile, acid was applied directly to the parchment to elicit the letters, but corroding it significantly. This research method entailed difficulties and ran the risk of ruining invaluable materials.Against this background and in cooperation with the Vatican Library, we have been working on a whole new research project on palimpsest since 2005. With the aim of developing hardware that minimizes the burden on manuscripts and user-friendly and functional software, we have progressed with research based on the latest digital technology. I will now summarize the development process and the results achieved as of the present moment.■ConclusionThe answer to the question: “Why the invention of letterpress printing has brought about the media revolution?” can be summarized in four points, based on what I have mentioned above. Among others, I would like to focus on why the printing industry was able to establish a position, namely, how it became able to mass-produce printed matter of consistent quality, on the day.047

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