TIL modern day Japanese swordsmiths are required by law to use traditional Katana forging techniques, despite the fact that modern day steel does not need to be folded multiple times. : r/todayilearned
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Cross section of a traditional Japanese sword & different blade compositions - Album on Imgur
Were the Japanese swords the only ones to be folded when forged or was it a worldwide smithing technique used when forging swords? - Quora
Japanese Katana, The Traditional Handmade Full Tang Katana are Available in 1060 Carbon Steel, Damascus Folding Steel, T10 Steel and Hardyfield Steel (Cloud-dragon-1060) : Sports & Outdoors