This flavorless, colorless oil is expressed from the seeds of the safflower, also called saffron thistle or bastard saffron. It contains more polyunsaturates than any other oil, has a high smoke point (which makes it good for deep-frying) and is favored for salad dressings because it doesn't solidify when chilled. Safflower oil isn't as nutritionally beneficial as some of the other oils, however, because it lacks vitamin E. See also fats and oils.