Most wines are sold in glass bottles and are sealed using a cork.
Recently a growing number of wine producers have begun sealing their product with alternative closures such as screwcaps or synthetic plastic "corks." Some wines are packaged in heavy plastic bags, which are typically packaged further within cardboard boxes, similar to the packaging of breakfast cereal. One advantage of boxed-wine is that it can stay fresh for up to a month after opening, while bottled wine will start to oxidize immediately after opening. The contents of boxed wine are typically accessed via a tap on the side of the box. In addition to being less expensive, alternative closures prevent cork taint, although alternative closures can also cause other types of wine spoilage.
Wine cellars offer the opportunity to protect alcoholic beverages from potentially harmful external influences, providing darkness and a constant temperature.
Wine is a natural, perishable food product. Left exposed to heat, light, vibration or fluctuations in temperature and humidity, all types of wine, including red, white, sparkling, and fortified, can spoil. When properly stored, wines not only maintain their quality but can actually improve in aroma, flavor, and complexity as they mature.
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Information on this page sourced from http://en.wikipedia.org/wiki/Wine and is licensed under the GNU Free Documentation License.
