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对纸质材料的文化属性指定日期的方法，该方法没有明确写出其生产日期。这一方法是通过光学观察完成的，也就是无损调查。为此，我们调查了这些文化属性，特别是原始文件的书写纸张，深入到它们所拥有的机构。其中，主要有大道寺文献、东地宫文献、东大寺文献等。他们总共有15.000人。此外，关于前现代文件的书写纸张，为了确定文件是否真的会按照我们指定的方式制作，我们与造纸业高知技术中心合作，试验了水上、大竹等纸品的制作。因此，我们可以确认的第一个结果是，从中世纪到现代的论文写作的客观数据得到了充分的提供。第二个结果是，对于古代手稿的文字，我们厘清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令人信服的建议。

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.