For ordinary the beer customer awaits of his beer a good quality with a special flavour, a certain colour, a good foam stability and absence of haze. Moreover the breweries expect of their raw materials specific brewing properties for saving money. Each single of these requirements cannot be satisfied completely. Therefore compromises must always be sought. At the latest then, when the breweries decided becoming bigger and bigger (the longer the distance, the more distribution time), and when the "best before"- label was introduced for beer.