Crimson Water — A Katana in Hijin Koshirae

Crimson Water is defined by contrast.

A vivid crimson saya is set against black silk, darkened metal fittings, and the neutral polish of the blade. Rather than relying on excessive ornament, the design uses colour, proportion, and material restraint to create a strong visual identity.

At the centre of the piece is a TangGu Maru Blade using monosteel construction, paired with Hijin Koshirae. The result is a katana that feels contemporary in presentation while remaining grounded in the structure and visual language of traditional Japanese sword mounting.

Blade

The blade uses monosteel construction (Maru Blade) and follows a classic Shinogi-zukuri profile with Iori-mune and a medium-sized Chu-kissaki.

Its geometry is clean and restrained, allowing the shape and proportion of the blade itself to remain the focus.

A Shinken Hi runs along the blade and terminates in Marutome near the kissaki. The groove is fully polished, creating a clear and refined transition between the shinogi-ji and the surrounding blade surfaces.

Unlike a clay-tempered blade, this piece is fully heat-treated and does not depend on a visible natural hamon as its primary visual feature. Instead, its character comes from blade geometry, surface finish, and the relationship between the blade and the mounting.

With a blade length of approximately 71 cm, a motohaba of around 32 mm, and a kissaki of approximately 35 mm, the proportions remain balanced and practical.

Hijin Koshirae

The defining visual element of this piece is the Hijin Koshirae.

The saya is finished in a vivid, high-gloss crimson lacquer, making it the dominant colour within the composition. In contrast, the remaining mounting elements are deliberately kept darker and more restrained.

The koiguchi, kurigata, and kojiri are reinforced with water buffalo horn, combining durability with a clean visual transition across the saya fittings.

This contrast continues through the metalwork.

A blackened iron Kuruma-sukashi Tsuba introduces a simple openwork form without competing visually with the saya.

The Fuchi-Kashira are made from white copper and finished in a darkened tone with wave detailing, while the matching Menuki feature a dragon coiled around a sword.

Together, these elements provide depth and detail when viewed closely while preserving a restrained overall appearance.

Tsuka and Details

The tsuka is wrapped in black Japanese-made pure silk tsuka-ito over natural samegawa.

The dark silk continues the visual language established by the tsuba and fittings, while the natural samegawa introduces subtle texture beneath the wrap.

Hishigami are used beneath the tsukamaki to help maintain consistent diamonds and even tension throughout the handle.

A smooth white-copper Habaki creates a quiet transition between the polished blade and the darker mounting, reinforcing the balance between bright metal, black fittings, and the crimson saya.

A Study in Contrast

The identity of Crimson Water comes from the relationship between its materials rather than any single decorative element.

The blade remains visually neutral.

The fittings are dark and restrained.

The tsuka is almost entirely black.

Then the crimson saya becomes the single dominant colour.

This contrast gives the katana a distinct contemporary presence without abandoning the traditional structure of Japanese sword mounting.

For us, the piece is an example of how blade geometry, mounting design, material choice, and colour can be treated as one complete composition rather than as separate components.

Specifications

Blade Construction: Monosteel construction, Maru Blade
Blade Shape: Shinogi-zukuri
Mune: Iori-mune
Kissaki: Chu-kissaki
Blade Length: Approx. 71 cm
Motohaba: Approx. 32 mm
Sakihaba: Approx. 24 mm
Kissaki Length: Approx. 35 mm
Hi: Shinken Hi with Marutome termination
Tsuba: Blackened iron Kuruma-sukashi
Fuchi-Kashira: Darkened white copper with wave motif
Menuki: White copper dragon-and-sword motif
Tsuka-ito: Black Japanese pure silk
Samegawa: Natural ray skin
Saya: High-gloss crimson lacquer with water buffalo horn reinforcement
Habaki: Smooth white copper