Sparkling wine is a wine with significant levels of carbon dioxide in it, making it fizzy, unlike a still wine. While it is common to refer to this as champagne, European Union countries legally reserve that word for products exclusively produced in the Champagne region of France. Sparkling wine is usually either white or rosé, but there are examples of red sparkling wines such as the Italian Brachetto, Bonarda and Lambrusco, and the Australian sparkling Shiraz. The sweetness of sparkling wine can range from very dry brut styles to sweeter doux varieties (French for 'hard' and 'soft', respectively). The sparkling quality of these wines comes from their carbon dioxide content and may be the result of natural fermentation, either in a bottle, as with the traditional method, in a large tank designed to withstand the pressures involved (as in the Charmat process), or as a result of simple carbon dioxide injection in some cheaper sparkling wines. In European Union countries, the word "champagne" is reserved by law only for sparkling wine from the Champagne region of France. The French terms mousseux and crémant refer to sparkling wine not made in the Champagne region, such as Blanquette de Limoux produced in southern France. Sparkling wines are produced around the world, and are often referred to by their local name or region, such as Prosecco, Franciacorta, Trento DOC, Oltrepò Pavese Metodo Classico and Asti from Italy (the generic Italian term for sparkling wine being spumante), espumante from Portugal, cava from Spain, and Cap Classique from South Africa. Sparkling wines have been produced in Central and Eastern Europe since the early 19th century. "Champagne" was further popularised in the region late in the century, when József Törley started production in Hungary using French methods, learned as an apprentice in Reims. Törley has since become one of the largest European producers of sparkling wine. The United States is a significant producer of sparkling wine today, with producers in numerous states. Recently, production of sparkling wine was restarted by United Kingdom winemakers after a long hiatus.
History
Effervescence has been observed in wine throughout history and has been noted by Ancient Greek and Roman writers, but the cause of this mysterious appearance of bubbles was not understood. Over time it has been attributed to phases of the moon as well as both good and evil spirits. The tendency of still wine from the Champagne region to lightly sparkle was noted in the Middle Ages but this was considered a wine fault and was disdained in early Champagne winemaking although it was the pride of other historic sparkling wine production areas like Limoux. Blanquette de Limoux, from Languedoc, shows up in writings from as early as 1531 by the Abbey monks of Saint-Hilaire. Dom Pérignon was originally charged by his superiors at the Abbey of Hautvillers to get rid of the bubbles since the pressure in the bottles caused many of them to burst in the cellar. Later, when deliberate sparkling wine production increased in the early 18th century, cellar workers would still have to wear a heavy iron mask that resembled a baseball catcher's mask to prevent injury from spontaneously bursting bottles. The disturbance caused by one bottle's disintegration could cause a chain reaction, with it being routine for cellars to lose 20–90% of their bottles to instability. The mysterious circumstance surrounding the then unknown process of fermentation and carbonic gas caused some critics to call the sparkling creations "The Devil's Wine". The British were the first to see the tendency of wines from Champagne to sparkle as a desirable trait and tried to understand why it produced bubbles. Wine was often transported to England in wooden wine barrels where merchant houses would then bottle the wine for sale. During the 17th century, English glass production used coal-fueled ovens and produced stronger, more durable glass bottles than the wood-fired French glass. The English also rediscovered the use of cork stoppers, once used by the Romans but forgotten for centuries after the fall of the Western Roman Empire. During the cold winters of the Champagne region, temperatures would drop so low that the fermentation process was prematurely halted—leaving some residual sugar and dormant yeast. When the wine was shipped to and bottled in England, the fermentation process would restart when the weather warmed and the cork-stoppered wine would begin to build pressure from carbon dioxide gas. When the wine was opened, it would be bubbly. In 1662, the English scientist Christopher Merret presented a paper detailing how the presence of sugar in a wine led to it eventually sparkling and that by adding sugar to a wine before bottling it, nearly any wine could be made to sparkle. This is one of the first known accounts of understanding the process of sparkling wine and even suggests that British merchants were producing "sparkling Champagne" before the French Champenois were deliberately making it.
Semi-sparkling wine
Fully sparkling wines, such as champagne, are generally sold with 5 to 6 standard atmospheres (73 to 88 psi; 510 to 610 kPa) of pressure in the bottle. This is more than twice the pressure found in an automobile tire. European Union regulations define a sparkling wine as any wine with an excess of 3 atmospheres in pressure. These include German sekt, Spanish espumoso, Italian spumante and French crémant or mousseux wines. Semi-sparkling wines are defined as those with between 1 and 2.5 atmospheres of pressures and include German spritzig, Italian frizzante and French pétillant wines. The amount of pressure in the wine is determined by the amount of sugar added during the tirage stage at the beginning of the secondary fermentation with more sugar producing an increased amount of carbon dioxide gas and thus pressure in the wine.
Red sparkling wine While the majority of sparkling wines are white or rosé, Australia, Italy and Moldova each have a sizable production of red sparkling wines. Of these, Italy has the longest tradition in red sparkling wine-making, particularly along the Apennine side of the Po Valley. Notable wines include Brachetto and Lambrusco. Also very well known and with rich tradition are Gutturnio, Bonarda and sparkling Barbera; in central Italy, lesser known Red Vernaccia produces semi-sweet sparkling reds. In Australia, red sparkling wines are often made from the Shiraz grape.
Production
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