内山紙

長野県の雪晒し和紙。障子紙として知られる。

Uchiyama-washi, a distinguished traditional paper from Nagano Prefecture in the Chubu region of Japan, holds the esteemed designation of a National Traditional Craft. Its history stretches back over 300 years, with production beginning in the early Edo period. Initially serving local needs for document paper and household items, Uchiyama-washi quickly gained a reputation for its exceptional durability and beauty. It became crucial for official documents, religious texts, and even traditional sliding doors (shoji), embodying the region's commitment to meticulous craftsmanship and cultural preservation. The papermaking process relies exclusively on high-quality kozo (mulberry bark) fibers, renowned for their incredible strength and longevity. A defining characteristic of Uchiyama-washi is the unique 'snow bleaching' technique. Harvested kozo fibers are spread out on snow-covered fields during winter, where the natural UV light combined with melting snow gently bleaches the fibers. This eco-friendly method results in an exceptionally pure white paper without harsh chemicals, simultaneously enhancing the fiber's pliability. Following this, the 'nagashi-zuki' or flow method is employed. This intricate technique involves repeatedly dipping a screen (suketa) into a vat of fiber slurry, allowing a thin layer of fibers to build up evenly, creating a sheet with uniform thickness and superior strength due to the interlocking of long fibers. The combination of snow bleaching and nagashi-zuki imbues Uchiyama-washi with its distinctive qualities: remarkable strength, a soft yet crisp texture, and a naturally brilliant white hue. This handmade Japanese paper is celebrated for its longevity and elegant aesthetic, making it ideal for conservation, artistic endeavors, and high-end stationery. Uchiyama-washi continues to be a cherished symbol of traditional Japanese craftsmanship, preserving an artisanal legacy for future generations.