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Insights into Japanese sword knowledge and culture
Comprehensive explanation of hirazukuri (平造り), the simplest blade cross-section among Japanese sword construction methods. Covers characteristics of the flat cross-section without a ridge, reasons it's primarily used for short swords, historical changes across periods, and appreciation points.
This article provides detailed explanations of how Soshu and Bizen traditions differ in hira-zukuri tanto. It compares the characteristics of both traditions from the perspectives of jihada (steel grain patterns), hamon (blade patterns), and construction techniques, offering practical ways to distinguish them in person.
Okazaki Masamune, a swordsmith of the late Kamakura period, established the "Soshu style," characterized by strong nie (crystalline texture) and dramatic irregular hamon (blade pattern). Only a few signed blades by Masamune remain today. This article explains the revolutionary techniques he passed to his disciples, known as the "Ten Disciples of Masamune," and why he is considered the greatest in Japanese sword history.
An explanation of when and how the "curve (sori)"—the most distinctive morphological feature of the Japanese sword—came into being. This article examines the transition process from straight swords (ancient swords) to curved tachi swords from both historical and technical perspectives, considering changes in combat styles and the development of forging techniques.
This article explains the production and distribution systems the Kamakura shogunate established to supply blades in large quantities to the gokenin. It provides an overview of the sword-making industry during the Kamakura period, including the development of specialized workshop divisions, the migration and settlement of sword smiths, and comparative features of the major production centers in Bizen, Yamashiro, and Yamato.
Explains the composite structure of kawagane (outer steel) and shingane (core steel)—the core technology of Japanese swords. Covers why hard outer steel and soft core steel are combined, the role of folding and forge welding, carbon content design, and modern metallurgical interpretation.
This article explains the types of kissaki (sword tip) shapes on Japanese blades and their forging and control methods. It details the characteristics of ko-kissaki, naka-kissaki, ō-kissaki, and inokubi-kissaki, their evolution across periods, adjustment techniques during forging, and appreciation points.
A comprehensive examination of the swordsmithing career of Koyama Munetatsu (1798–1854), the pinnacle of late Edo new-new sword (shin-shin-tō) craftsmanship. This article explains his relationship with his master Suishinshi Masahide, his devotion to the Sōshū tradition and establishment of a distinctive style, the technical characteristics of his representative works, and the background behind his acclaim as "the finest swordsmith of the Kantō region."
Detailed explanation of the devastating impact the 1876 (Meiji 9) Haitou-rei (sword-bearing prohibition) had on the Japanese sword industry and the subsequent transformation of the sword world. Examines the career transitions of unemployed sword smiths, survival strategies as art objects, and the inheritance of the Gassan and Suishinshi schools.
A detailed explanation of the "Mishina school" (みしなは), a group of swordsmiths active in Kyoto during the Edo period. This article covers the lineage from the founder through successive generations, the inheritance and unique development of Yamashiro tradition, technical characteristics of representative works, and modern market valuations.
The "spine" (mune) of the Japanese sword—the ridge shape opposite the blade's edge—is thoroughly explained. This guide systematically covers the cross-sectional structures of each type (iori-mune, maru-mune, kaku-mune, mitsu-mune, katakiriha-mune), their historical usage patterns across eras, and the criteria used in authentication.
This article provides a detailed explanation of the 'fire-control' (hikagenl) technique for uniform heat treatment of long swords exceeding 70-90 cm in blade length. It covers the temperature distribution issues in hardening furnaces, methods for controlling distortion and warping unique to long swords, and the fusion of veteran bladesmiths' empirical knowledge with modern technology.
