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Washi, Japan's hand-made paper, is strong enough to repair Louvre paintings and 1,000-year-old books
Washi is traditional Japanese paper made by hand from the inner bark fibres of three plants: the gampi tree, the mitsumata shrub and the paper mulberry, known as kozo. It has been used for origami, calligraphy, ukiyo-e woodblock prints and everyday goods such as clothing, toys and ritual objects for Shinto priests. Its long fibres make it tougher than Western paper made from wood pulp. Because it is thin, pliable and very low in impurities, it can last over 1,000 years and can be removed cleanly with moisture. This makes it a preferred material for repairing valuable paintings and books in museums such as the Louvre and the Vatican Museums. Washi is registered as a UNESCO intangible cultural heritage.
Washi is made from long inner-bark fibres that are soaked, beaten and suspended in water, then lifted on a screen so they form a mat. Those long, interlocking fibres give the sheet strength and flexibility, unlike short wood-pulp fibres. Its low level of impurities means it ages slowly and stays stable over centuries.
Washi shows how a craft shaped by Japanese plant materials and techniques ended up protecting cultural treasures in institutions around the world. Its status as UNESCO intangible heritage recognises the knowledge behind its making as well as the paper itself.
Washi was used to make wreaths given to winners of the 1998 Winter Paralympics.
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