A semi-drying oil is an oil which partially hardens when it is exposed to air. This is as opposed to a drying oil, which hardens completely, or a non-drying oil, which does not harden at all. Oils with an iodine number of 115–130 are considered semi-drying.
Examples of semi-drying oils Corn oil Cottonseed oil Sesame oil Grape seed oil Sunflower oil
See also Oil paint Seasoning cast iron
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