Wine is sold in tinted bottles because it spoils on exposure to sunlight. Exposure to heat, light, vibrations or even changes in temperature can spoil wine. Humidity can also dry out a wine cork, causing oxidation and spoiling the wine. Storage of wine is an important consideration for wine that is being kept for long-term aging. While most wine is consumed within 24 hours of purchase, fine wines are often set aside for long-term storage. Wine is one of the few commodities that can improve with age, but it can also rapidly deteriorate if kept in inadequate conditions. The three factors that have the most direct impact on a wine's condition are light, humidity and temperature. A fourth consideration is security for expensive wines. Historically, the storage of wine was handled by wine merchants. Since the mid-20th Century, however, consumers have been increasingly storing their own wine in home-based wine cellars.
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