Katana Jade Mist Maru Blade Shiratsuyu Koshirae 玉霞

Clay Tempered Full Tang Shinken (真剣) | Jade Mist Katana: TangGu (湯谷) Maru Blade (丸造) + TangGu (湯谷) Shiratsuyu Koshirae (白露拵)

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) style. The blade is clay-tempered (yaki-ire / 焼入れ) to produce a straight suguha hamon (直刃刃文). The koshirae includes a Musashi-gata sukashi tsuba (武蔵形透鍔), forged from tetsu (鉄地, iron) with a blackened finish (yaki-sabi / 煮黒) and a double-ring openwork design (sukashi / 透かし). The fuchi-kashira (縁頭) are made of hakudo (白銅) with a polished surface (migaki / 磨き). The shakudo (赤銅) habaki connects the blade and fittings. The menuki (目貫) feature a sword-and-dragon motif (剣龍図目貫), made of hakudo (白銅), blackened and polished. The tsuka is wrapped in ivory cotton ito (生成色木綿柄糸) over natural samegawa (鮫皮), with hishigami (菱紙) forming a diamond pattern (hishi-gumi / 菱組). The saya is finished in aka-urushi (赤漆) with water buffalo horn (gyūkaku / 牛角) at stress points. The ivory synthetic sageo (生成色合成下緒) completes the mounting.

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: Designed for Iaido (non-sharpened), Kenjutsu, and Tameshigiri (test cutting) practice

Blade Specifications

• Blade Length (Nagasa刃長): Approx 73 cm
• Tang Length (Nakago 茎長): Approx. 24 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)

• Forging Pattern (Hada 鍛肌): None (Modern monosteel; no visible hada)
• Hamono (Blade Pattern 刃文): Clay-tempered suguha-style (直刃) hamon – The blade is differentially hardened (yaki-ire / 焼入れ) to produce a functional 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:
  • High-grade shaping polish 上・成形研磨
  • High-grade rough polish 上・下研ぎ
  • High-grade final polish 上・仕上げ研磨
    
• Key Features:
  • Refined blade geometry and balanced weight distribution
  • Exceptional sharpness and durability with a clean, bright-polished edge (Hashiro)

Fittings and Mountings

Blade Fittings

• Tsuba (Handguard 鍔): Musashi-gata Sukashi Tsuba (武蔵形透鍔), tetsu (鉄地, iron), yaki-sabi (煮黒) finish. Double-ring sukashi (透かし) design.
• Fuchi-Kashira (縁頭): Hakudo (白銅, white copper), migaki (磨き) finish, no decorative patterns.
• Menuki (目貫): Sword-and-dragon motif (剣龍図目貫), hakudo (白銅), blackened and polished.
• Habaki (鎺): Shakudo (赤銅), polished surface.
• Samegawa (Ray Skin 柄鮫): Natural samegawa (鮫皮), under tsuka-maki.
• Handle Wrapping (Tsuka-maki 柄巻): 

  Ivory cotton ito (生成色木綿柄糸), hishigami (菱紙), hishi-gumi (菱組) pattern.

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): Aka-urushi (赤漆) with a glossy, reflective finish and subtle sparkling effect.

• Sageo (Cord 下緒): Ivory synthetic fiber sageo (生成色合成下緒), tightly woven for strength and visual harmony.

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