Blackberry (vintage): adj. The harvest is said to be ripe when the grape has reached its maximum maturity.
Thus, the level of tartaric acid will increase at the expense of malic acid, then decrease in turn, while the sugar level continues to increase until reaching a maximum. The maturity of the grape corresponds to this maximum in sugar, and this is the normal time for the harvest. Maturation lasts about seven weeks. Maturity checks must begin at the end of veraison in effect.
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