The legislation on mayonnaise has not been harmonised in the EU. In principle mutual recognition applies to the trade of mayonnaise within the EU. This means that a product produced in accordance with the legislation applicable in the country of production can be freely traded throughout the EU. At the request of buyers, the deviating legislation of the importing country may also be applied. The European industry has adopted a Code of Practice for Mayonnaise. This code specifies that the 'mayonnaise designation may only be used for oil-in-water emulsions with a minimum of 70% fat and a minimum of 5% egg yolks'. This is consistent with the Dutch rules in the Reserved Descriptions (Commodities Act) Decree. This Decree (Article 4) stipulates that the designation 'mayonnaise' may only be used for an oil-in-water type emulsion that at a minimum contains 70% fat and at a minimum 5% egg yolk. This provision does not apply to mayonnaise that has legitimately been placed on the market in other EU member states or countries that are part of the European Economic Area (EEA).