Usage

The katana's unique design and in particular its sharpness necessitate quite a few specialized precautions to handle it. Failure to observe these precautions can easily lead to damage to the weapon or severe injury.

Combat

See also: Battōjutsu, Iaidō, Iaijutsu, Kenjutsu, and Shinkendo

Storage and maintenance

If mishandled in its storage or maintenance, the katana may become irreparably damaged. It is extremely important that the blade remain well-oiled and polished, as the natural moisture residue from the hands of the user will rapidly cause the blade to rust if not cleaned off. Similarly, when stored for longer periods, it is important that the katana be inspected frequently and aired out if necessary in order to prevent rust or mold from forming (mold may feed off the salts in the oil used to polish the katana).^[7]