If using your hi carbon steel knife daily: when you wipe down your knife at the end of the day, put a drop or two of Mineral Oil or Coconut Oil and rub it into the exposed steel. Don't forget to wipe down the exposed tang (if full tang) and rub oil there, too. If you leave greasy prints or water on hi carbon steel, you will have rust and *pits* within a day or two. And then you'll have to spend time polishing those out, so never put the knife away wet, and always wipe off after use. For long term storage, keep the blade separate from the sheath.
Some sample photos of custom knifes that are sold.
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