Complete Guide to Tsuba Carving Techniques: Ke-Bori, Katakiribori, Maru-Bori, Taka-Bori and How to Tell Them Apart

The Role of Carving in Tsuba Decoration

Carving (hori) is the primary decorative technique for tsuba, encompassing all methods of shaping metal surfaces using chisels (nomi/tagane). Techniques divide broadly into removal carving (cutting away material to create recesses) and compression carving (pressing metal to deform it). Different techniques serve different visual purposes and are typically combined in masterwork pieces.

Ke-Bori (Hair Engraving)

Ke-bori cuts extremely fine lines — "as thin as hair" — using specialized thin-edged chisels. Applications include animal fur and feathers, leaf venation, fabric folds and hair. Quality is judged by line density, uniformity, and steady pressure. The finest ke-bori by masters like Nara Toshinaga achieves fiber-like texture visible to the naked eye.

Katakiribori (Oblique Chisel Carving)

Katakiribori uses an asymmetrical single-bevel chisel inserted at an angle, creating grooves with one steep wall and one gradual slope. The asymmetric cross-section creates shadow play that generates depth and dimensionality. Particularly effective for calligraphic characters and fine outlines, it can replicate the pressure-variation of brushwork in metal.

Maru-Bori (Round Carving)

Maru-bori creates rounded, half-spherical relief forms — ideal for fruits, stones, and spherical objects. Most effective in combination with taka-bori and ke-bori: dragon scales shaped as individual maru-bori forms, each detailed with ke-bori texture, produce extraordinarily realistic results.

Taka-Bori (High Relief)

Taka-bori raises motifs significantly above the surrounding ground — the apex of three-dimensional metalwork carving. Two approaches exist: cutting away the surrounding ground to leave the motif raised, and hammering from below (uchidashi) to push material upward. The finest examples by Goto family, Umetada, and Nara kinko masters raise subjects several millimeters above the ground, functioning essentially as three-dimensional sculpture. Evaluation criteria: height differential between apex and ground; smoothness of lateral slopes; detail completeness; shadow beauty under raking light.

Intermediate Techniques

Shishobori (medium relief) falls between taka-bori and flat levels. Usujishobori (thin relief) creates subtle elevation. These intermediate levels serve as transitions between primary high-relief subjects and background detail. Hira-bori (flat carving) and shizumi-bori (sunken carving) create shallow to moderate recesses, importantly serving as inlay preparation by creating the beds for zogan metalwork.

Combined Technique in Masterworks

Masterwork tsuba employ multiple techniques in organic combination. In a quality tiger-design tsuba, for example: the tiger body uses taka-bori; stripe patterns use shishobori slightly lower; fur detail uses ke-bori over the stripes; background bamboo uses katakiribori for recession; and the surrounding ground uses nanako (fish-roe punching) for texture. This layered complexity creates the depth that distinguishes masterworks from journeyman production.

Conclusion

Understanding carving techniques transforms tsuba appreciation from visual impression to direct dialogue with the maker's intentions and skills. Examining a tsuba under varying light angles to identify each technique at work is among the most intellectually rewarding activities in Japanese art appreciation.