Burtonisation is the act of adding sulphate, often in the form of gypsum, to the water used for the brewing of beer, in order to bring out the flavour of the hops. The name comes from the town of Burton upon Trent which had several very successful breweries due to the chemical composition of the local water.
In the early 19th century, pale ale was being successfully brewed in London. In 1822, the method had been copied by the Burton upon Trent brewer Samuel Allsopp, who got a more hoppy tasting ...