How do I care for a hand folded katana with a visible hamon or layered pattern?

 Updated Feb 2026

Hand folded katana require consistent oil maintenance to preserve both the steel quality and the visual surface characteristics that define their collector value. The primary care step is wiping with a soft lint-free cloth after every handling session, followed by a thin coat of camellia or mineral oil applied across the full blade surface. For T10 hamon pieces, pay particular attention to oiling the hamon boundary zone - the activity in this area involves very fine crystalline structures that are susceptible to surface oxidation. For Melaleuca layered pattern pieces, work the oil gently into the textured layer boundaries with a soft cloth. Never use abrasive materials or polishing compounds on any folded blade surface, as these will damage the very features - hamon activity, layer pattern - that define the piece's collector value. Inspect regularly under good light for any surface oxidation spots.

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