Sayanurishi: The Art of Lacquering and Leather-Wrapping Sword Scabbards — A Specialist Craftsman World and Technical System

What Kind of Craftsman is a Saya Nurier (Sheath Painter)?

The craftsmen who complete the saya (sheath) of Japanese swords are broadly divided into two types. The saya-shi (sheath maker) carves wood such as Japanese tree magnolia to create the wooden base of a shirasaya or fitted sheath, while the saya-nurier (sheath painter) is responsible for the subsequent surface finishing.

The work of a saya-nurier is not simple painting. It is an accumulation of specialized techniques requiring advanced knowledge and years of experience: selecting the type of urushi, primer preparation, sanding, managing the sequence of topcoats, and selecting and affixing leather. In the Edo period, saya-nuriers formed independent craftsman groups centered in three major cities—Edo, Kyoto, and Osaka—but in modern times, it is common for a single craftsman to work as both saya-shi and saya-nurier.

Types of Sheaths and Required Finish Work

The finish of a sheath varies greatly depending on its use.

Shirasaya (plain wood sheath): A plain wood sheath for storage with no finish applied. This is because applying urushi would impede the wood's breathing and make humidity control inside the sheath difficult. Shirasaya falls within the domain of the saya-shi, and the saya-nurier is not involved.

Nuri-saya (lacquered sheath): A fitted sheath for practical and ceremonial use, finished with urushi. Before the Edo period, "kuro-urushi-nuri" (black lacquer finish) was the most common finish, and the black sheath indicating the rank of the samurai warrior was an iconic part of their appearance.

Kawamaki-saya (leather-wrapped sheath): A sheath finished by wrapping samegawa or deer leather around the wooden base. It offers high practicality, and unifying the material with the samegawa of the tsuka creates overall cohesion in the fitting. In the "Satsuma-koshirae" (Satsuma fittings) of the Satsuma domain, leather-wrapped sheaths were preferred.

Types of Urushi and Finishing Processes

Urushi comes in many varieties depending on the refinement of the raw material, its origin, and its intended use. The main types of urushi used by saya-nuriers are as follows.

Ki-urushi (raw lacquer): Natural urushi before refinement, used for primer coating. When first soaked into the wooden base, it strengthens the wood while enhancing the adhesion of subsequent lacquer layers.

Suki-urushi (transparent lacquer): Refined, semi-transparent urushi used as an intermediate layer in red or black lacquer finishes. It is an important material that influences the color development of colored lacquer.

Kuro-urushi (black lacquer): Lacquer blackened by mixing iron or charcoal powder. A standard finish for samurai sheaths, it is inexpensive and highly durable.

The basic finishing process consists of three stages: primer coat → intermediate coat → topcoat. However, for the highest quality finish, even the primer alone may include multiple sanding operations, resulting in 10 to 15 or more steps. Allowing sufficient drying time between each process—in the case of urushi, a temperature and humidity-controlled room called an urushi-muro is necessary—is key to quality.

Leather-Wrapped Sheath Technique—Selection and Application of Samegawa

Samegawa (shark skin leather) is famous for being used as a wrapping underlayer for the tsuka, but it is also sometimes used on parts of the sheath. More precisely called "same-kawa," the countless small protrusions (shield scales / jun-rin) present on the skin of rays and sharks function as an abrasive material and also serve as a non-slip coating.

The basic technique for affixing samegawa to a sheath involves softening the leather with water, pressing it onto the wooden base, and allowing it to contract and adhere as it dries. However, finishing the seams and smoothing the surface require high skill.

Deer leather wrapping is an iconic finish of Satsuma-koshirae, with its natural pale brown color offering a simple, robust character different from black lacquered sheaths. It gained steady popularity among the samurai class from the late Edo period onward.

The Modern Saya-Nurier—Succession of Craft and Challenges

In modern times, craftsmen who specialize solely in being a saya-nurier have become extremely rare. Among sword craftsmen registered with organizations affiliated with the Japan Sword and Art Preservation Society, only about several dozen are active as "saya-nuriers," and aging and lack of successors are serious concerns.

The challenges facing modern saya-nuriers are not limited to technical succession. The sustainable viability of the industry is being questioned, as evidenced by: sharp price increases in high-quality natural urushi (domestic urushi costs several to dozens of times more than imported urushi), declining numbers of skilled lacquer artisans, and management difficulties due to insufficient orders.

On the other hand, growing interest in Japanese swords and efforts to preserve lacquer craft as a Japanese cultural heritage are shining new light on the work of saya-nuriers. The demand for traditional black lacquered sheaths remains solid, and the work of saya-nuriers continues as fittings accompanying the works of contemporary sword makers.

While the work of saya-nuriers receives less attention than blade polishing or sword forging, it is an essential specialized craft that completes the "exterior" of the Japanese sword as a comprehensive work of art and is a technique that should continue to be passed down in the future.