How Can You Tell If Dough Has Spoiled?

The difference between normal souring and spoilage in yeasted dough is in the intensity of the smell. Freshly fermented dough has a mild, pleasant tang, while spoiled dough develops a sharp smell like alcohol or acetone. This change may indicate that the dough has gone beyond normal fermentation and begun to spoil. What visual signs should you look for? Gray, bluish, or black spots on the surface indicate mold. Even if the spots look small and confined to one area, mold may have sent invisible, threadlike growth deeper into the dough, so cutting out the spot does not make the rest of the dough safe. Liquid that collects on the surface and turns pinkish or yellowish may also indicate unwanted bacterial growth. Healthy dough rises evenly as it ferments and becomes porous. Spoiled dough may fail to rise or may suddenly collapse after rising, becoming unusually loose and almost liquid. Healthy dough feels elastic when stretched, while spoiled dough may tear easily or stick to your fingers and leave thin, stringy strands. How long can dough be kept in the refrigerator? Kneaded raw dough should generally be used within 3-4 days when stored in a tightly sealed container in the refrigerator. Beyond this period, fermentation may get out of control and the signs described above may appear. Yeasted dough left at room temperature may become overly sour and spoil much sooner, often by the end of a day. Freezing is a safe way to store dough longer: well-wrapped dough can be kept in the freezer for 1-2 months and thawed slowly in the refrigerator on the day it will be used. If thawed dough shows any of the spoilage signs above, do not use it; it may have started to spoil before freezing. Baking moldy or overly sour dough does not remove the mold or spoilage. Toxins produced by some types of mold are not broken down even at high oven temperatures and can cause food poisoning. Dough with a questionable appearance or smell should be thrown away without tasting. Yeasted dough, such as bread, pizza, or roll dough, spoils at a different rate from unleavened dough, such as cookie or pastry dough. The live microorganisms in yeasted dough make it ferment and sour faster, so it may change after more than a few days even in the refrigerator. In unleavened dough, the process is slower and spoilage may first show as a dry, hardened surface. In each of the two types of dough, once moisture collects on the surface and mold begins to grow, the dough is no longer safe. In summer, a warm kitchen speeds up fermentation, so leaving dough at room temperature for even a short time may cause faster souring and spoilage than in winter. Covering rising dough with airtight plastic wrap instead of a damp cloth can reduce crusting and the risk of mold forming early on the surface.