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SESK: Stuff Everyone Should Know · sesk.info/wood-olive-oil-rancid

Which common kitchen oil can turn rancid on a wooden cutting board?

Olive oil, a vegetable oil.

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  1. Mineral oil
  2. Olive oil ✔
  3. Paraffin wax

Why: Vegetable oils like olive, corn, peanut and safflower feed microbes and can go rancid, giving the board bad odors and flavors. Mineral oil and paraffin wax do not spoil.

Huh, didn't know that: The handbook calls paraffin (candle) wax one of the simplest ways to finish wooden food items, applied by gently warming the board.

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References

Answer: Olive oil. Vegetable oils like olive, corn, peanut and safflower feed microbes and can go rancid, giving the board bad odors and flavors. Mineral oil and paraffin wax do not spoil.

  1. Wood Handbook: Wood as an Engineering Material, FPL-GTR-282 (USDA Forest Products Laboratory, 2021) research.fs.usda.gov/treesearch/62200
    Vegetable oils also can become rancid and may impart undesirable odors or flavors to food.
    Checked 2026-10-10.

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