How should I store an aikuchi tanto to protect it long-term?
Updated Mar 2026
The flush-fit construction of an aikuchi creates a tighter seal between the saya mouth and the handle collar than you find on guarded tanto mounts. While this looks elegant, it also means moisture is more likely to be trapped near the habaki if the piece is kept in a humid environment. To prevent surface oxidation, apply a thin, even coat of choji oil to the blade before storage, removing any excess with a clean soft cloth. Store the piece horizontally in a wooden display case lined with acid-free fabric or paper, in a room with stable, low humidity. Avoid airtight plastic cases, which can trap condensation. Check and re-oil the blade every three to six months if the piece is not in regular rotation.