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To the phenols counting colorless substance that is embedded in the plant cell wall and thereby causes lignification (lignification, lat. lignum = wood). He is also responsible for the so-called "yellowing" of paper. Lignin is after that cellulose the second most common organic substance on earth. It is of course also in the Oak wood with a share of over 20% and plays as a preliminary stage flavorings an important role. At the toasting from barrique barrels lignin becomes aromatic aldehydes reduced. The most important is vanillin that at Barrique got into the wine. See also under tannins,

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