A few grains begin to change color under the action of the sun. We call this phase of the cycle of the evolution of the grape : The Ripening.
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| Pinot Noir are turning red. |
Sugars are now starting to build up in the grape and causes a fall in organic acids. The grape is now at its final size.
The new color also marked the appearence of the phenolic compounds that are tannins :
-Anthocyanins are going to give the red color to the skin.
-Flavones make grain pale green, slightly transparent.
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