Waiting for Oenologue

Everyone's on picking standby. Grapes for rosé are on the brink of ripe perfection... but we must wait for the go-ahead from the Oenologue. 

Before his visit, a minimum of 200 berries from the plot to be assessed are picked at random: 2 or 3 berries picked from each cluster taken from the interior and exterior, placed in an open container and not refrigerated. 

 Then, exactly one hour before the Oenologue arrives, while saving a number of berries, the rest are crushed and the juice strained. Measurements are made of the degree of potential alcohol (sugar), and acidity. 

The Oenologue arrives at 8 in the morning. He looks at the berries, the analysis, and tastes the juice. He delves deep into his wealth of knowledge and experience. He chews thoughtfully on the grape skins. Then he opens his eyes, and tells us whether to harvest on Monday or on Tuesday.