where do the tannins in wine come from
Wine color Red drupe grapes can produce white wine if they are quickly pressed and the juice not allowed to be in contact with the skins. The color is mainly due to plant pigments, notably phenolic compounds (anthocyanidins, tannins, etc.). The color depends on the presence of acids in the wine. It is altered with wine aging by reactions between different active molecules present in the wine, these reactions generally giving rise to a browning of the wine, leading from red to a more tawny color. The use of a wooden barrel (generally oak barrels) in aging also affects the color of the wine.
Champagne Contrary to legend and popular belief, Dom Pérignon did not invent sparkling wine, though he did make important contributions to the production and quality of both still and sparkling Champagne wines.[7][8] The oldest recorded sparkling wine is Blanquette de Limoux, which was apparently invented by Benedictine Monks in the Abbey of Saint-Hilaire, near Carcassonne in 1531.[9] They achieved this by bottling the wine before the initial fermentation had ended. Over a century later, the English scientist and physician Christopher Merret documented the addition of sugar to a finished wine to create a second fermentation, six years before Dom Pérignon set foot in the Abbey of Hautvillers. Merret presented a paper at the Royal Society, in which he detailed what is now called méthode champenoise, in 1662.[10] Merret's discoveries coincided also with English glass-makers' technical developments that allowed bottles to be produced that could withstand the required internal pressures during secondary fermentation. French glass-makers at this time could not produce bottles of the required quality or strength. As early as 1663 the poet Samuel Butler referred to "brisk champagne".[11]