How to Tell If Yeasted Dough Has Spoiled or Turned Sour

A mildly sour smell and rising can be part of dough fermentation; they do not establish safety. Safe storage periods for sourdough and commercially yeasted dough cannot be determined from smell alone. What should be checked on the surface?Discard dough or starter with mold, unusual pink or orange patches, or a rotten odor. Do not try to mix away a suspect film. Do not sniff deeply at dough with visible or suspected mold. What does rising show?Rising, collapse, or liquid separation can indicate changes in fermentation and dough structure; these alone are insufficient for a safety decision. Dough and a continually fed sourdough starter are different products; do not apply one’s storage rules to the other. Do ingredients affect storage time?Ingredients such as milk and eggs also affect storage conditions. Follow the package or a reliable recipe’s refrigeration, fermentation, and baking instructions; do not use one day limit for every dough. For longer storage, freeze if the recipe permits and thaw in the refrigerator. Freezing does not undo previous unsafe storage. How should safety be assessed?Raw flour and eggs can carry harmful microorganisms; do not taste raw dough. Normal appearance and smell do not establish safety. Discard dough with uncertain storage conditions or suspected spoilage; prepare other dough using the recipe’s complete baking process.