Examine: Decarbonization of 4 different steels in a ceramic and heat up to 1200C by a kiln. Carbon contents was loose 50%.
Short knives made from above smelted steels by sword smith Nobumasa Hayasaka in Miyagi pref.
Hungarian swords made in 7 Century AD.
Please visit “Journal Articles”.
Ainu sword in Arizona USA (pictured by Walter)
蕨手刀研究（書籍）
