Quick Diagnosis
WHAT is the crumb doing?
🛒 Recommended Products
We recommend the following tools for this recipe:
Digital Kitchen Scale
Accurate weighing prevents hydration mistakes that cause a wet crumb
Instant-Read Thermometer
Verify internal loaf temperature to ensure it's fully baked
Dutch Oven or Cast Iron Pot
Traps steam for oven spring while allowing thorough baking
Parchment Paper
Makes transferring loaves into a hot dutch oven safer and cleaner
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Causes & Solutions
Underbaked / internal temperature too low
very commonSymptoms:
- • Loaf feels soft in the center when tapped
- • Internal temp below ~205°F / 96°C
- • Crumb is doughy and tastes like raw starch
Why does this happen?
Sourdough needs sufficient time and temperature for starch gelatinization and crumb set. Insufficient bake leaves starches gelatinized but not set, producing a wet crumb [1].
🚨 Immediate Fix:
Return loaf to oven: Bake at 230–250°C / 450–480°F in a covered vessel for 10–20 minutes, then uncovered until internal temp reaches 96–99°C (205–210°F). Use an instant-read thermometer to confirm.
📅 Long-term Fix:
Use a covered baking method like a Dutch oven and monitor internal temp during development; extend bake 5–10 minutes if crumb tests indicate doughy center [1].
🧪 Test:
Measure internal temp with an [instant-read thermometer](https://amzn.to/49Xsgwp). Aim for 96–99°C (205–210°F) for most lean sourdoughs.
Too high hydration for current dough strength / underdeveloped gluten
commonSymptoms:
- • Very slack, spreading dough
- • Holes irregular and crumb collapses around large bubbles
- • Gummy, shiny crumb despite full bake
Why does this happen?
High hydration increases gelatinized starch proportion and requires well-developed gluten to hold structure. If gluten is weak, gas escapes and crumb collapses, leaving wet pockets [1][2].
🚨 Immediate Fix:
For future bakes reduce hydration by 2–5% (weigh with a digital kitchen scale) or increase gluten development: add more stretch-and-folds or a short autolyse (20–40 min) before salt [1].
📅 Long-term Fix:
Build dough strength over multiple bakes: adjust bulk fermentation times, use higher-protein flour or add a short rest + extra folds. Track results with photos and baker's percentages [2].
🧪 Test:
Perform a windowpane test after folds: a thin membrane indicates sufficient gluten to support higher hydration.
Over-fermentation followed by collapse and dense center
commonSymptoms:
- • Dough rose, then sank; surface wrinkly
- • Crumb is unevenly open, denser in center
- • Sour aroma stronger than usual
Why does this happen?
When fermentation advances too far, yeast and bacteria exhaust sugars and weaken gluten. The structure can collapse in the oven or during cooling, yielding a moist, gummy center [2].
🚨 Immediate Fix:
If still shippable, bake immediately. Expect flatter loaf and moister crumb; ensure full bake to reduce gumminess.
📅 Long-term Fix:
Shorten proof, proof cooler, or retest shaping technique. Watch dough with poke test and learn your kitchen's timing [2].
🧪 Test:
Poke test: well-proofed dough springs back slowly and leaves a slight indent; over-proofed dough doesn't spring back and is prone to collapse.
Incorrect use of whole-grain or freshly-milled flour (higher water absorption)
mediumSymptoms:
- • Dough needed much more water than recipe
- • Crumb remains moist even after long bake
- • Loaf sticky after cooling
Why does this happen?
Whole-grain and fresher flours absorb more water and contain more soluble fibers; they can create a wetter crumb if hydration isn't adjusted or rested longer to hydrate bran fully [2].
🚨 Immediate Fix:
Allow longer bake and rest; consider slicing later (see cause-6). For future batches reduce hydration or increase autolyse time and use a portion of white flour to balance absorption.
📅 Long-term Fix:
Weigh flours precisely with a digital kitchen scale, note absorption, and adapt hydration seasonally [2].
🧪 Test:
Compare dough behavior when using same recipe with different flours; whole-grain batches often need 2–6% less water or more resting time.
Cutting the loaf too soon — residual heat and starch retrogradation
very commonSymptoms:
- • Crumb looks set after baking but becomes gummy as it cools
- • Cutting hot center shows glutinous strands
Why does this happen?
Freshly baked crumb continues to set during cooling as moisture redistributes and starches firm. Cutting too soon allows steam to escape and the center to remain under-set and gummy [1].
🚨 Immediate Fix:
Let the loaf cool on a rack at least 2 hours (longer for large loaves). If already cut and gummy, toast or re-bake slices to dry them for immediate use.
📅 Long-term Fix:
Plan for adequate cooling time; schedule baking so the loaf can cool fully before slicing [1].
🧪 Test:
Cool one loaf fully and one only briefly; comparison shows cooling's effect on crumb set.
Insufficient oven heat or poor heat retention
mediumSymptoms:
- • Loaf browned but center undercooked
- • Oven temperature fluctuates or thermostat inaccurate
Why does this happen?
An oven that runs cool or loses heat during the bake prevents full crumb gelatinization; also thin baking vessels or no steam management can affect internal set [1][2].
🚨 Immediate Fix:
Preheat oven thoroughly (45–60 minutes) and use a preheated Dutch oven or baking stone. Increase bake temp by 10–20°C for a short period if needed, then reduce.
📅 Long-term Fix:
Calibrate your oven, use an external thermometer, and adopt a covered-to-uncovered bake schedule for steam control [1].
🧪 Test:
Use an oven thermometer and an [instant-read thermometer](https://amzn.to/49Xsgwp) in the loaf to confirm stable temps during the bake.
🆘 Can I save this loaf?
Loaf is borderline underbaked (soft center) right after cooling
Solution: Return whole loaf to oven at 200°C / 400°F for 10–20 minutes, tented with foil to avoid over-browning, until internal temp reaches 96°C / 205°F.
Success chance: good
Loaf is gummy because of too-high hydration or collapse
Solution: Slice and toast slices or make grilled sandwiches; re-baking slices at 180–200°C / 350–400°F for 8–12 minutes helps dry the crumb.
Success chance: good for usability, poor for original texture
Crumb became gummy after cutting too early
Solution: If slices are soggy, separate and re-toast or dry in oven; for whole loaf allow full cool next time.
Success chance: good
Prevention
- ☐ Weigh ingredients with a digital kitchen scale to control hydration precisely
- ☐ Use an instant-read thermometer to confirm internal temp ≥96°C / 205°F
- ☐ If using high-hydration or whole-grain dough, increase gluten development (folds) and autolyse time [1][2]
- ☐ Cool loaves at least 2 hours before slicing to allow crumb to set
- ☐ Use a covered bake (e.g., Dutch oven) for first part of bake to balance crust and internal set