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How to store cooking oil
Keep the cap or lid on the oil bottle when you are not using it.
One of the main causes of oil turning rancid is exposure to too much oxygen. When you are not using the oil, keep the cap or lid on the container.
Store the oil in a dark-colored glass bottle with a tight-fitting cap. Even if the oil comes in a clear, glass bottle, consider transferring it to a blue or green one.