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In the mid-19th century the French chemist Louis Pasteur and others explained the nature of fermentation and identified the yeasts responsible for it. Prior to the 19th century little was known about the process of fermentation or the causes of spoilage. After the vineyards recovered, European governments protected the reputations of the great regions by enacting laws that allotted regional names and quality rankings only to those wines produced in specific regions under strictly regulated procedures. Egyptian records dating from 2500 bce refer to the use of grapes for wine making, and numerous biblical references to wine indicate the early origin and significance of the industry in the Middle East. The centrality of wine in the Eucharist led to monks growing grapes to make wine, and monasteries became important agents in wine production during the Middle Ages. It is unclear when his cult gained popularity, but in 186 BCE the Senate forbade rites in his honor in the decree Senatus consultum de Bacchanalibus.

Its popularity spread around the Mediterranean during Classical antiquity, and was sustained in Western Europe by winemaking monks and a secular trade for general drinking. The thousands of grape varieties that have been developed, with 5,000 reported for V. vinifera alone, differ from one another in such characteristics as colour, size, and shape of berry; juice composition (including flavour); ripening time; and disease resistance. Stainless steel fermentation and storage tanks are easily cleaned and can be refrigerated to precise temperatures. Mechanized innovations in the 20th century have mainly contributed to quality control. Later in the century, methods were developed for growing pure strains of specific yeasts in culture.

Once the wine is swallowed or spat out, the length of time the flavours remain detectable is an indicator of quality. The origin of these scents may be the grapes used, or the fermentation or maturation process. Cooler temperatures suppress aroma, and therefore faults detectable on the nose, but increase sensitivity to tannins and bitterness. An increasing number of wine producers use alternative closures such as screwcaps and synthetic "corks". The bottles used for sparkling wine must be thick to withstand the pressure of the gas behind the cork, which can be up to 6 standard atmospheres (88 psi).

Types of Sparkling Wines

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• They generally undergo secondary fermentation to create carbon dioxide, which remains dissolved in the wine under pressure in a sealed container.

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• It is unclear when his cult gained popularity, but in 186 BCE the Senate forbade rites in his honor in the decree Senatus consultum de Bacchanalibus.

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• How wines get their unique flavors and aromasHow the chemical composition of wines affects their flavours.(more)
• Wine grape harvest Workers harvesting grapes for wine at a vineyard in Tuscany, Italy.

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• Producers have used an increased interest in the Mediterranean diet, with wine as one of its constituent parts, to drive sales; in continental western Europe, wine is considered an everyday pleasure.

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• The total global consumption of wine was in decline in the early 2010s, primarily because the French and Italians were drinking considerably less.

Some wines undergo a secondary, malolactic fermentation, in which the harsher malic acid is converted into lactic acid by bacteria. If permitted by law, the winemaker may include additives such as sugar, to increase the alcohol content (chaptalization), or adjust the acid levels. For red wines, winemakers may choose to encourage the extraction of tannins and flavor from the grape skins by agitating the mixture.

Viticulture

Most wines are sold in glass bottles, traditionally sealed with a cork stopper. Wine grapes grow mainly between 30 and 50 degrees latitude north and south of the equator, although the effects of climate change and advances in viticulture are increasing the area under vine elsewhere. In the context of wine production, terroir is a concept that encompasses the growing environment of the vine, including elevation and slope of the vineyard, type and chemistry of soil, and climatic and seasonal conditions. There are several ways of making sweet wines, such as the use of grapes affected by noble rot (e.g. Sauternes), exposed to freezing temperatures (e.g. icewine), or dried (e.g. Vin Santo). After the Second World War, winemakers focused on quality and marketing to cater for a more discerning audience, and wine remains a popular drink in much of the world.

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The spread of viticulture

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For consistency, non-vintage wines can be blended from more than one vintage, which helps winemakers maintain a consistent flavor profile. Even within a single area, however, aspects such as the soil type and depth can lead to different results, as can the variety of grape being grown, as different varieties tolerate different types of weather. In most of Europe, good vintages correlate with years of plenty of sunshine and average-to-warm temperatures, whereas bad vintages almost always occur in cold and/or wet years with little sunshine. Most of a vintage's characteristics are a result of the weather experienced by the vines during their growth cycle; the interaction between weather, grape varieties and terroir leads to different areas thriving under different conditions. Wine indicating a vintage contains the juice of grapes harvested that year, with the exception of Eiswein picked in early January, which is dated the previous year. Some producers have created voluntary schemes to allow producers to indicate adherence to a stricter set of criteria than required by law, such as Appellation Marlborough Wine in New Zealand and Meritage in the USA.

Aeration in a decanter may benefit younger wines by "opening them up", releasing more flavor, but aerating older wines can oxidize them. Nevertheless, the increase of the value of fine wines since the 1970s has led to a corresponding increase in relabeling fraud. Such instances of fraud have a history dating back to Ancient Greece, but wine fraud has become less common overall since the late 19th century as legal frameworks and appellation systems have become stricter and more widespread. Wine fraud can take several forms, such as mixing a wine with a cheaper one to increase profits, surreptitiously adulterating it with additives, or passing it off as a more expensive wine by relabeling it.

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Common Types of Red and White Wine

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Burgundy is also popular, negroni quotes with the 2016 Romanée-Conti fetching £3,250 per bottle, as well as Italian wines such as Barolo, Barbaresco, and those of Tuscany. Bordeaux is especially popular for investment, due to its fame, high volume of output, longevity, and relatively simple naming system. Wines with corks are typically stored horizontally to help keep the cork moist, but this is not necessary for screwcaps. Wine is important in cuisine; it can be used in preparation and tenderizing, as well as a flavor agent in marinades, stocks, stews (e.g. coq au vin, beef bourguignon), and sauces (e.g. in wine sauces). The total global consumption of wine was in decline in the early 2010s, primarily because the French and Italians were drinking considerably less. On the palate the taster experiences the mouthfeel of the wine, including its sweetness, acidity, bitterness, tannins, and alcohol, as well as saltiness in the case of sherry.

Research has demonstrated that music can enhance the experience of drinking wine, an example of crossmodal perception, and Champagne producer Krug provides pairing suggestions for music and its wines. Classically inspired scenes such as the bacchanalia continued to feature in 20th century artworks by artists such as André Derain and Pablo Picasso, tending to depict wine consumption in a more positive light. In the 19th century, avant-garde paintings inspired by everyday life naturally featured wine, often as the catalyst for overindulgence and drunkenness.

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European classifications

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How wines get their unique flavors and aromasHow the chemical composition of wines affects their flavours.(more) Beginning in the 1960s, the use of mechanical grape harvesters and field crushers allowed quick harvesting and immediate transfer to fermentation tanks. Advances in plant physiology and plant pathology also led to better vine training and less mildew damage to grapes. To combat this parasite, V. vinifera scions (detached shoots including buds) were grafted to species native to the eastern United States, which proved almost completely resistant to phylloxera. In California the centre of viticulture shifted from the southern missions to the Central Valley and the northern counties of Sonoma, Napa, and Mendocino. The prime wine-growing regions of South America were established in the foothills of the Andes Mountains.

The color of the wine may indicate its age, with red wines becoming paler and white wines becoming darker, although color is also influenced by the grapes used. The palate is more sensitive to sweetness at higher temperatures, so when the sweetness is not balanced by acidity a wine should be served cooler. However, alcohol begins to evaporate noticeably over 20 °C (68 °F), and the carbon dioxide in sparkling wines is released too quickly at temperatures of about 18 °C (64 °F).