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In contrast to the typical use of wine and wild yeasts in the fermentation process, the Domecq vineyards used a different process. They themselves sep­arated, selected, and cultivated yeast which they used to promote the fermentation. Some of the other houses using modern fermen­tation tanks, such as Diez-Merito, for example, achieved much the same thing by leaving some must from their best fermentations in the ...Different Processes of Fermentation and Aging