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Mike Rodriguez — Fayetteville, North Carolina asks,
My dry Merlot has been aging in a carboy in my garage for about four months. I made a kit and have racked it two or three times now. The wine has recently changed and not for the better. I’m noticing a distinct vinegar aroma whenever I un-stop the carboy. What is this, can I fix it, and is there any way to prevent it happening again?