The manufacture of washi (Japanese paper) using local materials and clear water developed in Ino-cho in the Niyodogawa basin more than 1,000 years ago. Eventually, centering on this town, the manufacture of washi achieved spectacular development throughout Kochi Prefecture thanks to the improvement, ahead of other producing regions, of paper-manufacturing tools aimed at the increased production of high-quality paper and a positive response to the introduction of Western culture and technology in the Meiji period (1868–1912). From the later Meiji period into the Showa period (1926–89) Kochi Prefecture boasted the highest production of hand-made washi in Japan. The texture of washi made by hand according to elaborate and mature traditional techniques is highly praised as an expression of the unique aesthetic of Japan.
One of the features of Tosa washi is that while traditional techniques have been carried on, a search has continued for new forms of manufacture and as a result a variety of washi has been produced. Of the hand-made paper produced by original techniques cultivated by craftspeople over generations, Tosa Tengujo-shi is the ultimate washi in terms of thinness and toughness. At just 0.03 mm, it is the thinnest paper in the world. Until the mid-Showa period large quantities were exported to Europe and the United States for use as typewriter paper. Today it is used for the production of art and craft goods, such as chigiri-e (torn paper art), and also for the restoration of cultural property. Many other types of washi are manufactured as well for a variety of uses, including thick paper, glossy paper, stiff paper, and colorful paper.