ArticleLate Malolactic, Wine Kit Ingredients, and Color QuestionsWritten by Alison CroweYour Zinfandel probably had a good reason (in the wine’s opinion, anyway) why it didn’t go through ML fermentation.Already a member? Log InYou'll Also Like Article MEMBERS ONLY The Sulfite Blues, Curing A Stuck Fermentation and Freezing Grapes Your Zinfandel probably had a good reason (in the wine’s opinion, anyway) why it didn’t go through ML fermentation. Already a member? Log In Article MEMBERS ONLY Soapy Taste, Wine Pumps, and Testing Sulfite I suspect you’ve got a fatty acid issue caused by your stuck/sluggish fermentation. S. cerevisiae can emit fatty acids when under fermentive stress . . .