What material are the ink drawings in the Aman Hotel in Kyoto, Japan made of?

Xuan paper. Xuan paper is a traditional Chinese calligraphy and painting paper, produced in Jing County, Anhui Province, with a tough texture, no ink seepage, no insects, etc., divided into two kinds of raw Xuan and cooked Xuan. Raw Xuan is strong in water absorption and blotting, which makes it easy to produce rich variations of ink rhythms. Ripe Xuan, on the other hand, is weaker in water absorption and blotting, which makes it suitable for repeated coloring, making it the best paper for calligraphy and painting. The ink painting of Aman Hotel in Kyoto, Japan has the style of Chinese ink painting, which uses Xuan paper as the painting material.