How should I care for a T10 carbon katana to preserve its quality?
Updated Feb 2026
Caring for a T10 carbon katana follows the same core principles as any high-carbon steel Japanese sword collectible, with particular attention to protecting the polished blade surface and hamon detail. After any handling session, wipe the blade from habaki collar to tip with a soft, lint-free cloth to remove fingerprints - skin oils left on the surface will cause oxidation spots on unprotected T10 steel over time, and if these develop near the hamon line they can affect the visual clarity of that detail. After wiping, apply a thin coat of camellia oil or mineral oil using a clean cloth and buff away any excess until only a barely-visible film remains. For T10 blades with a visible hamon, be careful not to over-oil - excess oil can obscure the hamon's visual contrast in the polished area near the temper line. Store the katana on an open display rack in a stable, low-humidity environment: sealed cases trap moisture that promotes surface oxidation despite the protective oil. Inspect the mekugi pin periodically to confirm it is properly seated. With this simple, consistent routine, a T10 carbon katana will maintain its blade quality and hamon clarity for many years of display.