Aging:
The process by which wine matures, in bulk or in bottles or both, to achieve smoothness (in acidity), mellowness (in tannins and other phenols) and unique character and complexity. The major activities in this process are the chemical reduction of certain compounds into others, primarily by hydrolysis or oxidation, and the joining together of short molecular chains into longer ones. Volatile esters, ethers and acids create bouquet, which is not the same as aroma.
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