Washi (和紙) is a type of paper made in Japan. Washi is commonly made using fibers from the bark of the gampi tree, the mitsumata shrub (Edgeworthia papyrifera), or the paper mulberry, but also can be made using bamboo, hemp, rice, and wheat. Washi comes from wa meaning Japanese and shi meaning paper, and the term is used to describe paper made by hand in the traditional manner.
Washi is generally tougher than ordinary paper made from wood pulp, and is used in many traditional arts. Origami, Shodo, and Ukiyo-e were all produced using washi. Washi was also used to make various everyday goods like clothes, household goods, and toys as well as vestments and ritual objects for Shinto priests and statues of Buddha. It was even used to make wreaths that were given to winners in the 1998 Winter Paralympics. Several kinds of washi, referred to collectively as Japanese tissue, are used in the conservation and mending of books. Washi was developed from the traditional Chinese paper-making process.
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Washi is produced in a way similar to that of ordinary paper, but fewer chemicals are used. It involves a long and intricate process that is often undertaken in the cold weather of winter, as pure, cold running water is essential to the production of washi. Cold inhibits bacteria, preventing the decomposition of the fibers. Cold also makes the fibers contract, producing a crisp feel to the paper. It is traditionally the winter work of farmers, a task that supplemented a farmer's income.
Kozo is the most commonly used fiber in making Japanese paper. The kozo branches are boiled and stripped of their outer bark, and then dried. The fibers are then boiled with lye to remove the starch, fat and tannin, and then placed in running water to remove the lye. The fibers are then bleached (either with chemicals or naturally, by placing it in a protected area of a stream) and any remaining impurities in the fibers are picked out by hand. The kozo is laid on a rock or board and beaten.
Wet balls of pulp are mixed in a vat with water (and, in some cases, neri, which is a mucilaginous material made from the roots of the tororo plant) and one of two traditional methods of paper making (nagashi-zuki or tame-zuki) is employed. In both methods, pulp is scooped onto a screen and shaken to spread the fibers evenly. Nagashi-zuki (which uses neri in the vat) produces a thinner paper, while tame-zuki (which does not use neri) produces a thicker paper.
With enough processing, almost any grass or tree can be made into a washi. Gampi, mitsumata, and paper mulberry are three popular sources.
See also: List of Washi
Until the early 20th century, the Japanese used washi in applications where wood pulp paper or other materials would normally have been used. This is partly because washi was cheaper, but also because the unique characteristics of washi made it a better material. The different uses of washi are too numerous to mention, but include the following: