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Mineral Oil
Mineral oil has medicinal uses but its main use in the kitchen is to saturate your cutting board and other wood items to make them water resistant. Unlike vegetable oils, mineral oil will never go rancid or dry into a varnish.
Made from the same basic feed stock as diesel fuel and gasoline, mineral oil is refined until it is water clear and safe for human consumption - but it's indigestible and should never be used for cooking. Basically, it's a liquid form of vaseline. Find it at a local pharmacy or in the medicines section of your local supermarket. SOURCE

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