How to Care for High-Carbon Steel High-carbon steel is the gold standard for functional, forged weapons like swords and khukuris due to its incredible durability and edge retention. However, unlike modern stainless steel kitchen knives, forged carbon steel requires regular maintenance to prevent rust and oxidation.
1. Cleaning Your Weapon After every use—whether you are cutting targets in the backyard or just handling the blade—you must clean it. The natural oils and moisture from your fingertips are enough to start the rusting process. Wipe the blade down completely with a clean, dry microfiber cloth. If you cut through organic material (like wood or fruit), use rubbing alcohol on a cloth to remove any sticky residue before drying it.
2. Oiling the Blade To protect the steel from the moisture in the air, your blade needs a protective coating. Apply a light, even coat of oil over the entire surface of the metal.
Mineral Oil: The most accessible and cost-effective option. It is food-safe and won't degrade over time.
Choji Oil: The traditional choice for Japanese swords, made of mineral oil and a touch of clove oil for scent.
Gun Oil (e.g., Ballistol or Rem Oil): Excellent for long-term storage and heavy-duty rust prevention.
3. Proper Storage Never store your sword or dagger in a leather sheath for extended periods. Leather absorbs moisture from the air and contains tanning chemicals that will trap that moisture directly against the steel, causing rust. Instead, store your blade outside its sheath, in a wooden scabbard, or wrapped in an oiled cloth. If you are displaying it on a wall, try to avoid areas with high humidity or direct sunlight.