It was developed by the Oji Oleochemical Paper Research Institute, a joint venture between Oji Paper and Mitsubishi Petrochemical, to address the problem of depletion of wood resources due to increased consumption. The institute applied for basic patents for its manufacturing technology in Japan, Europe, the United States, and many other countries, and was widely talked about as the "development of a dream paper. In 1971, Yupo was announced, and it is now used in many places as a material that combines the characteristics of film and paper. Among the more than 20 types of Yupo series, Yamamoto Shigyo has carefully selected the best for alcohol ink art. Size: 55×91mm 50sheets Grain direction: short grain paper