Phenolic content in wine - quercetin. Like other flavonoids, the concentration of flavonols in the grape berries increases as they are exposed to sunlight. Some viticulturalists will use measurement of flavonols such as quercetin as an indication of a vineyard's sun exposure and the effectiveness of canopy management techniques. Anthocyanins are phenolic compounds found throughout the plant kingdom, being frequently responsible for the blue to red colors found in flowers, fruits and leaves. In wine grapes, they develop during the stage of "veraison" when the skin of red wine grapes changes color from green to red to black. As the sugars in the grape
The Fox and the Grapes in the labyrinth of Versailles. He can therefore afford a thoughtful, moralising tone: But Benserade then adds another quatrain, speculating on the fox's mental processes; finally it admits that the grapes really were ripe but 'what cannot be had, you speak of badly'. One of La Fontaine's early illustrators was the artist Jean-Baptiste Oudry, who was also artistic director at both the Beauvais and the Gobelins tapestry works. In consequence of this a series based on La Fontaine's fables designed by Oudry was produced by them during the 1740s and included "The Fox and the Grapes". These stayed in production