This GSO standard specifies a method for the determination of the acidity of oils in oilseeds. The acidity is expressed, by preference, as an acid value or alternatively as conventional calculated acidity. The acidity may be determined on the oil from the product as received (pure seed and impurities) or, if required, on the pure seed and possibly on the impurities. The method is not applicable to cotton seed with adherent cotton linters, or to oil palm or olive fruits. NOTE 1: Owing to the particularly poor results obtained during interlaboratory tests on seeds and fruits with high lauric acid content (copra and palm kernel), the application of this method to these oilseeds is at present problematic.