Establishes a test method for determining overall migration from one surface only of the plastics in the form of finished articles intended to come into contact with a fatty foodstuff, by filling the finished article with olive oil and leaving for 10 days, 24 h or 2 h at 40 deg C or for 2 h at 70 deg C. This method enables testing of non-homogenous articles providing that they are not too large and is most suitable for plastics in the form of containers.