The basic research for assignment of the date on cultural properties of paper materials(documents, classical books, the sacred teachings, drawings)

本研究的目的是建立一种方法来确定纸质材料文化属性的日期，这是不明确写其制造日期。这种方法是通过光学观察，即非破坏性调查。为此，我们调查了这些文化财产，特别是原始文件的书写纸，前往拥有它们的机构。其中主要的是大德寺的文献，东寺百古文字，东大寺文字等。他们总共达15.000英镑。此外，关于前现代文献的书写纸，为了确定是否真的能按照我们指定的方式制作纸张，我们与造纸工业的高知技术中心合作，尝试制作水原上，Otakadanshi或其他东西。因此，我们可以确认的第一个结果是充分提供了从中世纪到现代的写作低谷的客观资料。第二个结果是，对于古代手稿的书写纸，我们明确了它们随时间变化的轮廓和它们的光学判断方法。我们认为我们能够提出一个合适的建议。

The object of this research is to establish the method to assign the date on cultural properties of paper materials, which is not clearly written its manufactured date. The way was done by optical observation, that is, undestructive investigation. To do so, we investigated these cultural properties, especially, the writing paper of original documents, going to the institution which is possessed to them. Main ones of them, are the Documents of Daitokuji Temple, Toji-Hyakugomonjo, Todaiji-Monjo, ect... They amount to 15.000 in all. Also, about the writing paper of documents of pre-modern age, to ascertain if the papers will actually be made by the way we assigned, we experimented in making of Suibaragami, Otakadanshi, or something, in cooperation with Kochi technical center of the Paper Industry. Consequently, the first result we can confirm is the full provision of the objective data of writ ing papers from medieval ages to modern ones trough. The second result is that, as to the writing papers of ancient manuscript, we clarified the outline of their changing with the time and the method of optical judgement of them. We think we came to be able to make a conformable suggestion.