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Exclusion of sunlight from Syrah grapes

What do you think would happen to a grape cluster's color, tannins and flavor if researchers forced that cluster -still attached to the vine- to develop inside a dark box, cut out from any sunlight?

 

See the full text at: http://www3.interscience.wiley.com/cgi-bin/fulltext/120127352/PDFSTART

 

 

149 completely shading Syrah clusters.pdf