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Concept
Reinheitsgebot
Summary
The Reinheitsgebot (ˈʁaɪnhaɪtsɡəboːt, literally "purity order") is a series of regulations limiting the ingredients in beer in Germany and the states of the former Holy Roman Empire. The best known version of the law was adopted in Bavaria in 1516 (by William IV), but similar regulations predate the Bavarian order, and modern regulations also significantly differ from the 1516 Bavarian version. Although today, the Reinheitsgebot is mentioned in various texts about the history of beer, historically it was only applied in the duchy of Bavaria and from 1906 in Germany as a whole, and it had little or no effect in other countries or regions.
The most influential predecessor of the modern Reinheitsgebot was a law first adopted in the duchy of Munich in 1487. After Bavaria was reunited, the Munich law was adopted across the entirety of Bavaria on 23 April 1516. As Germany unified, Bavaria pushed for adoption of this law on a national basis (see Broader adoption).
According to the 1516 Bavarian law, the only ingredients that could be used in the production of beer were water, barley and hops. The text does not mention yeast as an ingredient, although yeast was at the time knowingly used in the brewing process. It is likely that brewers of the time preferred to see yeast as a fixture of the brewing process. Yeast produced in one batch was commonly transferred to a subsequent batch, thus giving yeast a more permanent character in the brewing process. A full understanding of the chemical basis of yeast and the fermentation process did not come until much later.
The 1516 Bavarian law set the price of beer (depending on the time of year and type of beer), limited the profits made by innkeepers, and made confiscation the penalty for making impure beer.
Official source
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