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Beer style is a term used to differentiate and categorize beers by various factors such as colour, flavour, strength, ingredients, production method, recipe, history, or origin.

The modern concept of beer style is largely based on the work of the late Michael Jackson in his 1977 book The World Guide To Beer in which Jackson categorised a variety of beers from around the world into local style groups according to local customs and names.^[1] In 1989, Fred Eckhardt furthered Jackson's work publishing The Essentials of Beer Style^[2]. Although the systematic study of beer styles is a modern phenomenon, the act of distinguishing between different varieties of beer is ancient and widespread, dating to at least 2000 BC.

The study of what constitutes a beer's style can be broken down into various elements. These may include the amount of bitterness imparted to a beer from bittering agents such as hops, roasted barley, or herbs; the amount of sweetness from the sugar present in the beer; the strength of the beer from the amount of fermentable material converted into alcohol; the smoothness or viscosity of the beer in the mouth, commonly described as mouthfeel; and the appearance of the beer, including the colour.

Contents 1 History of beer styles 2 Elements of beer style 2.1 Appearance 2.2 Aroma 2.3 Flavour 2.4 Mouthfeel 2.5 Strength 2.5.1 Gravity 2.5.2 Alcohol concentration 2.6 Yeast 2.7 Grains 2.8 Hops 2.9 Water 2.10 Other ingredients 3 Beer Styles 3.1 Ale 3.2 Lager 3.3 Spontaneous fermentation 3.4 Hybrid beers 4 Other fermented drinks based on cereals 5 Bibliography 6 References 7 External links 7.1 Special Application

[edit] History of beer styles

The history of beer style would be the history of beer itself. The Alulu Tablet, a Sumerian receipt for "best" ale written in Cuneiform found in Ur, suggests that even in 2050 BC there was a differentiation between at least two different types or qualities of ale. The work of Bedrich Hrozny on translating Assyrian merchants' tablets found in Hattusa, revealed that approximately 500 years later the Hittites had over 15 different types of beer.

Documents in various countries over the years reveal comments on different local brewing methods or ingredients. Pliny the Elder in his Naturalis Historia wrote about Celts brewing ale "in Gaul and Spain in a number of different ways, and under a number of different names; although the principle is the same." Anglo-Saxon laws reveal they identified three different ales, while the Normans mention cervisae (ale) and plena cervisia (full bodied ale) in the Domesday Book.

By the 1400s brewers in Germany and the Low Countries were using hops to flavour and preserve their ale; this new style of ale was called beer. When this trend came to Britain and brewers of beer in Southwark, London, started to take sales away from the traditional brewers of unhopped ale, there were complaints and protests. Various laws were passed favouring either beer or ale for a number of years, until hopped beer became the standard style throughout Europe.

Also in the 1400s, brewers in Bavaria were storing beer in cool caves during the summer months in order to stop it spoiling. The beer became known as lager from the German word lagern, meaning "to store".

Although beers using naturally-dried malt would have been pale-coloured, by the 1600s most malts in Europe would have been dried over a fire, resulting in a dark coloured beer. When coke started to be used for roasting malt in 1642, the resulting lighter coloured beers became very popular. By 1703 the term pale ale was starting to be used, though the beer it described was a lightly-hopped ale, very different from more bitter modern versions.

However, despite an awareness by commentators, law-makers, and brewers that there were different styles of beer, it wasn't until Michael Jackson's World Guide To Beer was published in 1977 that there was an attempt to group together and compare beers from around the world.^[1] Jackson's book had a particular influence in North America where the writer Fred Eckhardt was also starting to explore the nature of beer styles. The wine importing company Merchant du Vin switched to importing beers mentioned in Jackson's book. Small brewers started up, producing copies and interpretations of the beer styles Jackson described.

While North America developed beer styles into a serious study with fixed parameters of bitterness, colour, aroma, yeast, ingredients and strength, other countries continued to mainly categorise beers loosely by strength and colour, with much overlapping of naming conventions.

[edit] Elements of beer style

Beers may be categorized based on a number of factors.

[edit] Appearance

SRM/Lovibond Example Beer color EBC 2 Pale lager 4 3 German Pilsener 6 4 Pilsner Urquell 8 6 12 8 Weissbier 16 10 Bass pale ale 20 13 26 17 Dark lager 33 20 39 24 47 29 Porter 57 35 Stout 69 40 79 70 Imperial stout 138

The visual characteristics that may be observed in a beer are colour, clarity, and nature of the head. Colour is usually imparted by the malts used, notably the adjunct malts added to darker beers, though other ingredients may contribute to the colour of some styles such as fruit beers. Colour intensity can be measured by systems such as EBC, SRM or Lovibond, but this information is rarely given to the public.

Many beers are transparent, but some beers, such as hefeweizen, may be cloudy due to the presence of yeast making them translucent. A third variety is the opaque or near-opaque colour that exists with stouts, porters, schwarzbiers (black beer) and other deeply coloured styles. Thickness and retention of the head and the lace it can leave on the glass, are also factors in a beer's appearance.

[edit] Aroma

The aroma in a beer may be formed from the malt and other fermentables, the strength and type of hops, the alcohol, esters, and various other aromatic components that can be contributed by the yeast strain, and other elements that may derive from the water and the brewing process.

[edit] Flavour

The taste characteristics of a beer may come from the type and amount of malt used, flavours imparted by the yeast, and strength of bitterness. Bitterness can be measured on an International Bitterness Units scale, and in North America a number of brewers record the bitterness on this scale as IBUs.

[edit] Mouthfeel

The feel of a beer in the mouth, both from thickness of the liquid and from carbonation, may also be considered as part of a beer's style. A more dextrinous beer feels thicker in the mouth. The level of carbonation (or nitrogen, in "smooth" beers) varies from one beer style to another. For some beers it may give the beer a thick and creamy feel, while for others it contributes a prickly sensation.

[edit] Strength

The strength of beer is a general term for the amount of alcohol present. It can be quantified either indirectly by measurement of specific gravity, or more directly by determining the overall percentage of alcohol in the beer.

[edit] Gravity

Measurement of the specific gravity of the beer has traditionally been used as an to estimate the strength of beer by measuring its density. Historically, several different scales have been used for the measurement of gravity, including the Plato, Baumé, Balling, and Brix scales, with the Plato scale being the most common contemporary measure.

This approach relies on the fact that dissolved sugars and alcohol each affect the density of beer differently. Since sugars are converted to alcohol during the process of fermentation, gravity can be used to estimate the final alcohol. In beer brewing, a distinction is made between the original gravity, the gravity of the wort before fermentation has begun, and the final gravity of the product when fermentation has completed. Since the concentration of sugars is directly proportional to the gravity, the original gravity gives a brewer an idea of the potential alcoholic strength of the final product. After fermentation, the differences between the final and original gravities indicates the amount of sugar converted into alcohol, allowing the concentration of alcoholic strength to be calculated.

The original gravity of a beer was the basis for determining taxation in both the UK and Ireland from 1880 until the late 20th century, and a legacy of that system remains in the largely arbitrary division of bitter into "bitter", "best bitter", and "special bitter" substyles. In continental Europe, the strength of a beer in degrees Plato is sometimes used by a brewery to distinguish a particular beer produced in a line. For example, Rochefort Brewery produces three beers, all dissimilar in colour, flavour, and aroma; and sells them as Rochefort 6, Rochefort 8, and Rochefort 10, the numbers referring to the original gravities of the beers. Westvleteren Brewery, meanwhile, produces three beers, and calls them Blonde, 8, and 12.

[edit] Alcohol concentration

Modern classification of the strength of alcoholic beverages for the purposes of taxation and regulation typically discriminates according to the percentage of alcohol by volume, generally abbreviated as ABV. Additionally, although less common, some brewers throughout the world use also alcohol by weight (ABW) ^[3], particularly on low-point versions of popular domestic beer brands. At the relatively low alcohol concentrations of beer, the alcohol percentage by weight is roughly 4/5 of the ABV (e.g., 3.2% ABW is equivalent to 4.0% ABV).^[4], but this becomes increasingly inaccurate as the alcohol concentration increases.

Before the development of modern brewing practices and the complete understanding of the biochemistry of yeast, the final ABV of a beer could not be precisely controlled, making its value inconsistent and therefore unsuitable as a determinant for taxation or regulation. Contemporarily, though, ABV is often used in to determine the duty on beer and cider, and sales of beer and cider above a certain ABV is sometimes restricted or prohibited. For example, in the US state of Alabama the sale of beer over 6% ABV is illegal; meanwhile, in Texas, beers below 4% ABV cannot be sold as stout regardless of other stylistic considerations.^[5]

[edit] Yeast

A variety of different yeasts are used in making beer, most of which are strains of either top-fermenting yeast or bottom-fermenting yeast. Different strains impart different flavour and aroma characteristics, and may vary in which complex sugars they can ferment and how high their alcohol tolerance is, both of which are factors in attenuation. Some beers use other microbe types in addition to one of these, such as Lactobacillus or Brettanomyces. For example, the distinctive flavour and aroma of Belgian Abbey ales largely result from the yeast strains used to ferment the beer. There are a few modern styles, notably lambics, where spontaneous fermentation is used — that is, the unfermented wort is allowed to be colonized by microorganisms loose in the environment, rather than inoculated in a controlled fashion with a known organism.

[edit] Grains

Most beers use barley malt as their primary source of fermentable sugars, and some beer styles mandate it be used exclusively, such as those German styles developed under Reinheitsgebot. Some beer styles can be considered varietals, in the same sense as wine, based on their malt bill.^[6]

Kilned pale malts form the basis of most beer styles now in production, with styles that use other grains as a base distinguished by those grains (for example bock, which uses Munich malt as a base). The Rauchbier and Alaskan smoked porter styles are distinguished by the use of smoked malt.

Some styles use one or more other grains as a key ingredient in the style, such as wheat beer, rye beer, or oatmeal stout. Other grains such as corn and rice make less of a flavour contribution and are used primarily as an added source of fermentable sugars.

[edit] Hops

Hops contribute bitterness, flavour and aroma to a beer in different ways depending on when they are added during the brewing process. How much hop bitterness and aroma is appropriate varies considerably between different beer styles. There are many varieties of hops, some of which are associated with beers from specific regions. For example, Saaz hops are associated with Czech Pilsners, Hallertau and Tettnanger are two of the "noble" hop varieties one expects to find in German beers, and Kent Goldings are an English variety.

[edit] Water

Water is the main ingredient in beer, and, though water itself is flavourless, the chemical composition can have an influence on the finished taste; indeed, some brewers regard it as "the most important ingredient in beer".^[7] In particular, two styles of beer are especially noted for their water chemistry: pale ale, for which the process of Burtonisation is widespread; and Pilsener.

[edit] Other ingredients

Fruits and spices are key ingredients in some beer styles. While fruit beers and herb beers are often listed as style categories unto themselves, fruits and spices are sometimes used to contribute to the flavour and aroma profile of other styles. Vegetables have also been used in beers. Honey, molasses, candy sugar, or other fermentable sugars may be added to impart their distinct flavours to a beer. While not an ingredient per se, some brewers have experimented with aging their beer in barrels previously used for bourbon or other distilled spirits, imparting the flavour of both the wood and the spirit to the beer.

Alcoholic beverages made from the fermentation of sugars derived from non-grain sources are generally not called "beer," despite being produced by the same yeast-based biochemical reaction. Fermented honey is called mead, fermented apple juice is called cider, fermented pear juice is called perry (sometimes, pear cider) , and fermented grape juice is called wine. Chinese jiu and Japanese sake are made using much the same process as beer with one additional step in the fermentation as well as using rice instead of primarily barley malt.

[edit] Beer Styles

Most beer styles fall into broad types roughly according to the time and temperature of the primary fermentation and the variety of yeast used during fermentation. As the terminology of brewing arose before the advent of the science of microbiology, "yeast" in this context may refer not only to fungi but to some bacteria, for example Lactobacillus in Berliner Weisse.

[edit] Ale

Ale is beer that is brewed using only top-fermenting yeasts, and is typically fermented at higher temperatures than lager beer (15–23°C, 60–75°F). At these temperatures, ale yeasts produce significant amounts of esters and other secondary flavours and aromas, often resembling those of apple, pear, pineapple, grass, hay, banana, plum or prune.

Principal styles of ale include Barley Wine, Belgian Trippel, Belgian Dubbel, Altbier, Bitter, Amber Ale, Brown Ale, Pale Ale, Kölsch, Porter, Stout, and Wheat beer.

[edit] Lager

Pale lagers are the most commonly consumed type of beer in the world. Lagers are of Central European origin, taking their name from the German lagern ("to store"). Lager yeast is a bottom-fermenting yeast, and typically begins fermentation at 7-12°C (45-55°F) (the "fermentation phase"), and then stored at 0-4°C (30-40°F) (the "lagering phase"). During the secondary stage, the lager clears and mellows. The cooler conditions also inhibit the natural production of esters and other byproducts, resulting in a "crisper" tasting beer.

Modern methods of producing lager were pioneered by Gabriel Sedlmayr the Younger, who perfected dark brown lagers at the Spaten Brewery in Bavaria, and Anton Dreher, who began brewing a lager in Vienna, Austria, in 1840–1841. With modern improved fermentation control, most lager breweries use only short periods of cold storage, typically 1–3 weeks.

Most of today's lager is based on the original Pilsner style, pioneered in 1842 in the town of Pilsen (Plzeň), in an area of the Austrian monarchy now located in the Czech Republic. The modern pale lager that developed from Pilsner is light in colour and high in forced carbonation, with an alcohol content of 3–6% by volume. The Pilsner Urquell or Heineken brands of beer are typical examples of pale lager, with the Pilsner Urquell brand having a hop presence more associated with the pilsner style.

Principal styles of lager include American-style lager, Bock, Dunkel, Helles, Oktoberfestbier / Märzen, Pilsner, Schwarzbier and Vienna lager.

[edit] Spontaneous fermentation

Beers of spontaneous fermentation are ales that use wild yeasts, rather than cultivated ones. All beer was once brewed this way, but by the Middle Ages brewers had learned to crop the yeast from one brew and use it in the next. Only in a few isolated regions were wild yeasts still used. The best-known region where spontaneous fermentation is still used is the Senne Valley in Belgium, where lambic is produced.

[edit] Hybrid beers

Hybrid or mixed style beers use modern techniques and materials instead of, or in addition to, traditional aspects of brewing. Although there is some variation among sources, mixed beers generally fall into the following categories:

• Steam beers were invented by German immigrants living in California and are made with a type of bottom-fermenting (lager) yeast that can ferment at warmer (ale) temperatures. The name "steam beer" is a trademark of the Anchor Brewing Company, though other brewers brew this beer under the designation "California common".
• Fruit and vegetable beers are mixed with some kind of fermentable fruit or vegetable adjunct during the fermentation process, providing obvious yet harmonious qualities.
• Herb and spiced beers include herbs or spices derived from roots, seeds, fruits, vegetables or flowers instead of, or in addition to hops.
• Wood-aged beers are any traditional or experimental beer that has been aged in a wooden barrel or have been left in contact with wood chips or cubes. Often, the barrel or wood will be treated first with some variety of spirit or other alcoholic beverage; bourbon, scotch and sherry are common.
• Smoked beers are any beer whose malt has been treated by exposing it to smoke from burning or smoldering wood, such that a smoky aroma and flavour is usually present. The most traditional examples of this style are the Rauchbiers of Bamberg, Germany. However, many brewers outside of Germany—most notably American craft brewers—have been adding smoked malt to porter beers, Scotch ale and a variety of other styles.
• Champagne style beers are generally ales that are finished "à la méthode originale" for champagne. These are produced mainly in Belgium and include Grottenbier, Deus and Malheur Bière Brut.

[edit] Other fermented drinks based on cereals

• Boza
• Bozo
• Cauim
• Chhaang
• Chicha
• Gruit
• Kvass
• Oshikundu
• Pulque
• Sahti
• Sulima

[edit] Bibliography

[edit] References

[edit] External links

• The history of British beer styles
• The history of lager styles
• Michael Jackson's Beer Styles Index

• German brewers association in German (Translation)
• A founder of the first Belgian beer consumers group in Dutch (Translation)
• Danish beer consumers group in Danish (Translation)

[edit] Special Application

• 2008 BJCP Style Guidelines, index used by the Beer Judge Certification Program for categorising beers in home-brewing competitions
• Beer Styles by Campaign for Real Ale

v • d • e Styles of beer Ale · Lager British beer (England · Scotland · Wales) Barley wine · Bitter · Brown ale · India Pale Ale · Mild · Old ale · Porter · Stout Belgian beer Flanders red ale · Lambic · Oud bruin · Saison · Witbier German beer Altbier · Berliner Weisse · Bock · Dortmunder Export · Dunkel · Gose · Pale lager · Kölsch · Oktoberfestbier / Märzen · Roggenbier · Schwarzbier · Smoked beer · Wheat beer American beer Amber ale · American pale ale · American-style lager · Cream ale · Steam beer Other Baltic porter · Bière de Garde · Irish red ale · Pale ale · Pilsner · Scotch ale · Vienna lager See also History of beer