Quick Diagnosis
WHAT is the symptom?
🛒 Recommended Products
We recommend the following tools for this recipe:
Digital Kitchen Scale
Essential for accurate hydration and salt percentages
Dutch Oven or Cast Iron Pot
Traps steam for better oven spring and crust set
Instant-Read Thermometer
Verify internal temperature to confirm doneness
Parchment Paper
Eases transfer into hot vessel and prevents sticking
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Causes & Solutions
Underbaked — internal temperature too low
very commonSymptoms:
- • Crust browned but core is glossy or doughy
- • Loaf feels heavy and cool in center
Why does this happen?
Sourdough crumb sets at higher temperatures than the crust browns; typical target internal temp is 200–210°F / 93–99°C depending on hydration and whole grain content. Relying on color alone misleads because crust browns faster with steam or sugar from long fermentation [1].
🚨 Immediate Fix:
Return loaf to oven: Remove from vessel, place on a baking sheet and bake at 450°F / 230°C until internal temp reaches 200–205°F / 93–96°C (use an instant-read thermometer).
📅 Long-term Fix:
Use an instant-read thermometer routinely. For wet, high-hydration loaves aim for 205–210°F / 96–99°C. Extend bake time at lower temp if crust is darkening too quickly.
🧪 Test:
Measure internal temperature in the center of the loaf — doneness is defined by temperature, not just crust color [1].
Too high hydration without enough structure
commonSymptoms:
- • Very wide holes but a dense, wet core
- • Dough spread more than it rose
Why does this happen?
High hydration increases oven steam and open crumb, but if gluten development and coil folds didn't build sufficient network, gas collects in large pockets and the inner crumb can remain undercooked or gummy despite a baked crust [1][2].
🚨 Immediate Fix:
On the next bake reduce hydration by 2–4% or add one more set of stretch-and-folds to strengthen the matrix. Use a dough scraper to handle slack dough cleanly.
📅 Long-term Fix:
Build dough strength with timed folds, cold bulk retard to tighten crumb, and practice shaping to create surface tension.
🧪 Test:
If loaf feels overly soft and collapses slightly when cut warm, lack of structure from excessive hydration is likely.
Too rapid crust formation (hot oven or sugar on surface)
mediumSymptoms:
- • Dark, hard crust while interior remains raw
- • Scoring sealed and loaf didn't expand
Why does this happen?
If the crust hardens early (very high dome heat or sugar on surface), it prevents full expansion and trap heat from reaching the core, leaving it undercooked. Steam management and preheating strategy matter [1].
🚨 Immediate Fix:
For rescue, open the oven door briefly to reduce radiant top heat, lower temperature by 25°F/15°C and continue baking until internal temp is reached. On future bakes use a Dutch oven or cast iron pot or a cloche to control top heat.
📅 Long-term Fix:
Preheat vessel with oven; bake covered for first 20–30 minutes then uncover to finish browning.
🧪 Test:
If crust feels rigid early and internal temperature is low, the crust set too soon.
Severely underproofed — collapsed then raw center
commonSymptoms:
- • Dough dense with fewer bubbles, dough tears when scored
- • Loaf collapses in oven and interior remains gummy
Why does this happen?
Underproofed dough hasn't developed gas or elasticity; when heated, the structure can't expand properly and can collapse, leaving a compressed, undercooked crumb. Oven spring depends on retained elasticity and fermentative CO2 [1][2].
🚨 Immediate Fix:
If collapse occurred early in bake, you may need to bake longer at slightly reduced temp to dry the crumb without burning the crust. For future bakes allow longer final proof or warm proofing location.
📅 Long-term Fix:
Use the poke test to judge readiness: a properly proofed loaf springs back slowly and leaves a slight indent. Use a banneton proofing basket to support shape during final proof.
🧪 Test:
Poke gently — if it snaps back quickly it's underproofed; if it doesn't spring back at all it's over-proofed.
Poor heat penetration due to very large loaf or dense shape
mediumSymptoms:
- • Large boules have raw center while edges are done
- • Very tight tight-shaped loaves cook unevenly
Why does this happen?
Heat takes time to reach the center. Very large or dense loaves require longer bake times or lower temps for longer periods to allow heat to penetrate without burning the crust [1].
🚨 Immediate Fix:
Continue baking with lower oven temperature (e.g., 400°F / 200°C) until internal temp reaches target. Tent with foil to prevent overbrowning.
📅 Long-term Fix:
Bake slightly smaller loaves, split dough into two, or reduce oven temp after initial burst of heat.
🧪 Test:
Compare internal temperature in center vs near crust; a large delta indicates slow heat penetration.
Residual enzymatic activity / very strong sourness causing gummy crumb
rareSymptoms:
- • Gummy crumb develops after cooling rather than immediately after slicing
- • Loaf has pronounced acetic or acetic/vinegary smell
Why does this happen?
Extended fermentation with high enzyme activity (especially from whole grain) can break down starches and proteins, producing dextrins that retain moisture and create a gummy texture. Very acidic loaves can also inhibit crust set and change crumb behavior [2].
🚨 Immediate Fix:
Bake longer to ensure thorough gelatinization of starches; cool fully on a rack before slicing (preferably overnight).
📅 Long-term Fix:
Shorten bulk fermentation or retard in fridge to balance acidity; adjust hydration or use fresher flour.
🧪 Test:
If crumb firms up after 12–24 hours, enzymatic or gelatinization timing was the issue.
🆘 Can I Save the Loaf?
Loaf is glossy and doughy after full bake
Solution: Slice the loaf in half, place cut sides down on a baking sheet and bake at 375–400°F / 190–205°C until interior steams off and reaches 200°F / 93°C. Cool completely before re-evaluating.
Success chance: medium
Loaf collapsed early and is raw
Solution: Finish baking at lower temperature with foil tent, then cool fully. Use slices for toast or re-bake into croutons if texture remains poor.
Success chance: good for salvage, poor for aesthetics
Crumb gums up after cooling
Solution: Give it 12–24 hours cooling. If still gummy, repurpose: dry slices in oven for breadcrumbs or croutons.
Success chance: high for repurpose
Prevention
- ☐ Weigh all ingredients on a Digital Kitchen Scale to ensure correct hydration and 2% salt.
- ☐ Use an instant-read thermometer to confirm internal temperature: target 200–210°F / 93–99°C depending on hydration.
- ☐ Build gluten strength with folds or use a dough scraper while handling slack dough.
- ☐ Proof to visual cues: poke test and rounded, slightly domed top before bake.
- ☐ Use a Dutch oven or cast iron pot for controlled steam and even baking.
- ☐ Cool fully (ideally overnight) before slicing to allow crumb set and starch retrogradation [1][2].