What is Sēmu kawa in Japanese Katana terminology?

"セーム革" or "Sēmu kawa" translates to "Chamois Leather" in English. It is a type of leather that is made by tanning the hides of animals such as deer or goats with plant oils. This process gives the leather a suitable softness, making it ideal for applying oil to the blade of a sword. The oil helps to protect the blade from rust and other forms of damage, while the softness of the chamois leather ensures that the blade is not scratched or otherwise harmed during the oiling process.

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