(18)Packages containing mixes of different products or species of products covered by this Regulation are becoming more common on the market in response to certain consumers demand. Fair trading requires that products or species of products sold in the same package are of uniform quality. For products for which Union standards have not been adopted this can be ensured by recourse to general provisions. Labelling requirements should therefore be laid down for mixes of different products or species of products in the same package. They should be less strict than those laid down by the marketing standards as labelling of mixes is more burdensome and their application risks to obstacle the marketing of those products.