Sparkling wine is a wine with significant levels of carbon dioxide in it making it fizzy. The carbon dioxide may result from natural fermentation, (either in a bottle, as with the méthode champenoise , or in a large tank designed to withstand the pressures involved (as in the Charmat process) or as a result of carbon dioxide injection. The classic example of a sparkling wine is Champagne, but many other examples are produced in other countries and regions, such as Espumante in Portugal, Cava in Spain, Asti in Italy (the generic Italian term for sparkling wine being Spumante) and Cap Classique in South Africa. In some parts of the world, the words "champagne" or "spumante" are used as a synonym for sparkling wine, although laws in Europe and other countries reserve the word Champagne for a specific type from the Champagne region of France. The French terms " Mousseux " or " Crémant " are used to refer to sparkling wine not made in the Champagne region. German and Austrian sparkling wines are called Sekt. The United States is a significant producer of sparkling wine: California in particular has seen French Champagne houses open wineries in the state to make American sparkling wine according to the Champagne method. Recently the United Kingdom, which produced some of the earliest examples of sparkling wine, has started producing Champagne-style wines again. Sparkling wine is usually white or rosé but there are many examples of red sparkling wines such as Italian Brachetto and Australian sparkling Shiraz. The sweetness of sparkling wine can range from very dry "brut" styles to sweeter "doux" varieties.
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. 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 1700s, cellar workers would still have to wear 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 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 suggest that British merchants were producing "sparkling Champagne" before the French Champenois were deliberately making it.
The viticultural and winemaking practices of making sparkling wine have many similarities to the production of still wine with some noted divergence. At the vineyard, grapes are harvested early when there is still high acid levels. In areas like Australia, winemakers aim to harvest the grapes at 17 to 20° brix. Unlike still wine production, high sugar levels are not ideal and grapes destined for sparkling wine production may be harvested at higher yields. Care is taken to avoid tannins and other phenolic compounds with many premium producers still choosing to harvest by hand rather than risk mechanical harvesting which may split the berries and encourage maceration between the skins and juice. The press house is often close by the vineyard to where the grapes can be quickly pressed and separated from their skins. Red wine grapes like Pinot noir can be used in the production of white sparkling wines because their juice is initially clear and is only later tinted red through exposure to the color pigments in grape skins. While some skin exposure maybe desirable in the production of rosé sparklers and some blanc de noirs (white of blacks), most sparkling wine producers take extended precautions to limit the amount of skin contact.
The primary fermentation of sparkling wine begins like most other wines, though winemakers may choose to use specially cultivated sparkling wine yeasts. The wines may go through malolactic fermentation, though producers wishing to make fruitier, simpler wines will usually forgo this step. After fermentation the base wines are then blended to form a cuvee . While there are examples of varietal sparklers, such as blanc de blancs (white of whites) made from 100% Chardonnay, most sparkling wines are blends of several grape varieties, vineyards and vintages. Large Champagne producers like Moet & Chandon will use wines from several hundred base wines to create a blend that reflect the "house style" of their non-vintage wine. It is through the initiation of a secondary fermentation that distinguishes sparkling wine production and gives the wine its characteristic "bubbles". One of the by products of fermentation is the creation of carbon dioxide gas. While this gas is able to be released during the first fermentation, efforts are taken during the second fermentation to retain the gas and have it dissolve into the wine. This creates a massive amount of pressure within the wine bottle (on average around 5 atmospheres) and wine producers take care to package the wine in strong glass bottles. When the wine is open and poured into a glass, the gas is released and the wine becomes sparkling.
There are several methods used to carry out this secondary fermentation. The most well known is the Traditional or "Champagne method" where the base cuvee is bottled with a mixture of sugar and yeast. The introduction of a fresh yeast and food source (the sugar) triggers the fermentation process in the bottle that the wine will eventually be sold in. Through the process of riddling and eventually disgorgement, the dead yeast cells (lees) are removed from the wine while still maintaining the dissolved carbon dioxide gas. A dosage mixture of fresh wine and some sugar syrup is used to adjust the sweetness level of the wine after it has been disgorged. In the methode ancestrale the disgorgement step is skipped and the wine is sold with the lees still present as sediment in the wine. In the transversage method, after the wines have gone through the traditional method including riddling and disgorgement, the bottles are emptied into a large tank where they are then transferred to small and large format wine bottles such as 3 liter jeroboam and small split sizes used on airlines.
The Charmat method take places in stainless steel fermentation tanks that are pressurized. The fresh yeast and sugar mixture is added to the wine which rapidly stimulates fermentation in the pressurized environment. The wine is then cooled, clarified and bottled using a counter pressure filler. The process of carbon injection (or carbonation), the method used to make soda pop fizzy, doesn't involve initiating a secondary but rather injecting carbon dioxide gas directly into the wine. This method produces large bubbles that quickly dissipates and is generally only used in the cheapest sparkling wines.
An initial burst of effervescence occurs when the Champagne contacts the dry glass on pouring. These bubbles may form on imperfections in the glass that facilitate nucleation or on cellulose fibres left over from the wiping/drying process. Nucleati
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