On April 23, 1516 the Ducal brothers Wilhelm IV and Ludwig X issued a decree called the “Reinheitsgebot,” or “Purity Regulation.” This place an stop on the adulteration of beer. From then on, only barley (plus the malt made from it), hops and water might be used to provide it. https://advantages-of-storz-bicke69247.wikievia.com/10587542/facts_about_powerful_vaporization_revealed