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Sunflower oil is mainly a triglyceride. The British Pharmacopoeia lists the following profile:
Four types of sunflower oils with differing concentrations of fatty acids are produced through plant breeding and industrial processing: high-linoleic, high-oleic, mid-oleic, and high-stearic combined with high-oleic.
So sunflower oils that are high in polyunsaturated fatty acids (and low in monounsaturated fatty acids) on the composition label on the bottle are going to be the ones that 'dry'.