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 the finished product was exhibited. Another domestic use for the fable was as an architectural medallion on the outside of mansions, of which there is still an example dating from the turn of the 19th century on the Avenue Felix Fauré in Paris. A medallion of another kind, cast in bronze by Jean Vernon (1897–1975), was produced as part of his renowned series based on the fables in the 1930s. That of "The Fox and the Grapes" features two foxes scrambling up a trellis with what looks like more success than La Fontaine's creation. There was as diverse a use