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When wine making at home, if your grapes have been refrigerated or are too cold, use this unorthodox but quick trick, courtesy of Wine Maker Magazine: Heat up a small portion of the juice in the microwave, mix it back into the fermentation pail and retest the temperature. An electric blanket wrapped around the fermentation pail also works, but takes longer. For cooling, add a reusable ice pack and stir for a few minutes. Pitch the yeast when the temperature reaches 70 F to 75 F for reds and 55 F to 65 F for whites.
|Jennifer Mathes, Ph.D.|