How should I care for the blade to keep it display-ready?
Updated Mar 2026
Carbon steel requires proactive but straightforward care to stay in excellent display condition. Begin by wiping the blade clean with a soft, lint-free cloth after any handling, as skin oils accelerate surface oxidation on 1060 steel. Every two to three months — or more frequently in coastal or high-humidity environments — apply a very thin, even coat of mineral oil or choji oil using a clean cloth or dedicated nugui-gami paper. Avoid over-oiling, as excess oil can attract dust and pool near the habaki. When placing the katana in its saya for storage, insert it edge-up to follow traditional storage convention and reduce contact pressure on the blade's flat. Keep the piece away from direct heating vents or air conditioning outflow, both of which can cause the wood saya to dry out and the lacquer to crack at the seams.