Katana Abyssal Crimson Maru Blade Enryū Koshirae 炎龍

Clay Tempered Full Tang Shinken (真剣) | Abyssal Crimson Katana: TangGu (湯谷) Maru Blade (丸造) | Niku Geometry + TangGu (湯谷) Enryū Koshirae (炎龍拵)

This katana is hand-forged (Tezukuri / 手作り) from high-carbon modern steel (高炭素現代鋼) in the Maru-zukuri (丸造) construction style. The blade is clay-tempered (yaki-ire / 焼入れ) to produce a Sanbonsugi hamon (三本杉刃文), showcasing a bold and rhythmic temper pattern. The koshirae features a mokko-gata tsuba (木瓜形鍔) forged from tetsu (鉄地, iron) with openwork axe motifs (斧図透かし). The fuchi-kashira (縁頭) are made of hakudō (白銅), finely detailed with sea dragon motifs (海龍図). The habaki (鎺) is crafted from shakudō (赤銅), while the menuki (目貫) are made of hakudō (白銅), shaped in a stylised sword dragon design (剣龍図). The tsuka is wrapped in deep navy blue ito (濃紺柄糸) over natural white samegawa (白鮫皮), with hishigami (菱紙) forming a precise diamond pattern (菱組). The saya is finished in a glossy crimson red lacquer (赤漆塗り鞘) with a subtle sparkling effect, creating an ember-like shimmer under light. The sageo (下緒) is deep navy blue, tightly woven for durability and a refined finish.

TangGu (湯谷) Maru Blade

This blade is hand-forged (Tezukuri / 手作り) from high-carbon modern steel (高炭素現代鋼) in a monosteel construction called Maru-zukuri (丸造).

Blade Forging Details

• Blade Name: TangGu Traditionally Forged Maru Blade (丸造)
• Forging Method: This blade is forged in the Maru-zukuri (丸造) style from a single piece of modern high-carbon steel. It is clay-tempered (yaki-ire / 焼入れ) to produce a hardened edge with a visible hamon (刃文).
• Materials: Modern high-carbon steel (kōtanso gendai-kō / 高炭素現代鋼)
• Purpose: Suitable for Kenjutsu and Tameshigiri (test cutting) practice, collection, and display. Unsharpened blades are available for Iaido upon request.

Blade Specifications

• Blade Length (Nagasa刃長): Approx 71 cm
• Handle Length (Tsuka 柄長): Approx. 25 cm
• Width at Base (Motohaba 元幅): Approx. 32 mm
• Thickness at Base (Motokasane 元重): Approx. 6 mm
• Width at Tip (Sakihaba 先幅): Approx. 24 mm
• Thickness at Tip (Sakikasane先重): Approx. 4 mm
• Kissaki Length (Tip 切先長): Approx. 35 mm
• Mekugi-ana (Peg Hole 目釘穴): 1

Blade Characteristics

• Shape: Shinogi-zukuri (ridged blade 鎬造), Iori-mune (flat ridged spine 庵棟), Chū-kissaki (Medium-sized tip 中切先), Niku Geometry
• Forging Pattern (Hada 鍛肌): None (Modern monosteel; no visible hada)
• Temper Line (Hamon 刃文): Clay-tempered Sanbonsugi (三本杉) hamon – The blade is differentially hardened (yaki-ire / 焼入れ) to produce a distinct temper line.

Special Features and Workmanship

Hi (Groove) Engraving

• Type: Hi-Nashi (樋なし)
• Processing Range: None (No bohi) – Solid blade for added weight and strength

Polishing Work

• TangGu Polishing Levels:
  • Standard Polish
  • Sashikomi Polish

Fittings and Mountings

Blade Fittings

• Tsuba (Handguard 鍔): Mokko-gata Tsuba (木瓜形鍔) – Forged from tetsu (鉄地, iron) with openwork axe motifs (斧図透かし).
• Fuchi-Kashira (縁頭): Made from hakudo (白銅, white copper), featuring finely detailed sea dragon motifs (海龍図).
• Menuki (目貫): Crafted from hakudo (白銅), shaped in a stylised sword dragon design (剣龍図).
• Habaki (鎺): Shakudo Habaki (赤銅鎺) – Made from reddish copper alloy (shakudo / 赤銅) with a polished surface.
• Samegawa (Ray Skin 柄鮫): Natural rayskin (samegawa / 鮫皮) beneath the tsuka-maki.
• Handle Wrapping (Tsuka-maki 柄巻): Deep navy blue ito (silk or cotton) wrapped over hishigami (菱紙) in a traditional diamond pattern (菱組).

Saya and Accessories

• Saya (Scabbard 鞘): Traditional-style saya (拵風鞘), reinforced with water buffalo horn (牛角) at the koiguchi (鞘口), kojiri (鐺), and kurigata (栗形) for added durability.
• Saya Lacquer (鞘塗): Glossy crimson red lacquer with a fine sparkling effect.
• Sageo (Cord 下緒): Deep navy blue rayon sageo, tightly woven.

Measurements

• Blade Weight: Approx. 0.65 kg
• Sword Weight (without Saya): Approx. 1.0 kg
• Total Weight: Approx. 1.3 kg
• Overall Length: Approx. 102 mm