This International Standard specifies a method for the determination of the alkalinity of animal and vegetable fats and oils without distinguishing between the various constituents. The method is not applicable to dry melted animal fats, nor to oils and fats with an acidity greater than 60 % (mass fraction) as determined in accordance with ISO 660. NOTE Fats and oils can contain alkaline constituents either naturally (e.g. calcium soaps from bones) or accidentally (e.g. sodium soaps in imperfectly refined fats and oils).