Common Internal Bread Faults: Causes and Remedies

Slicing into a freshly baked loaf only to find an uneven crumb, unexpected holes, or a dull grey interior is one of the most frustrating experiences in the bakery. These are not random outcomes – they are internal bread faults, and each one has a clear cause rooted in the bread-making process. Unlike external faults that affect appearance, internal faults impact the crumb structure, texture, and flavor of the bread – the very qualities that define a good eating experience. Understanding what goes wrong inside the loaf, and why, is essential for any baker who wants to produce consistent, high-quality results.

What makes bread “good” on the inside? 🔗

Before diagnosing faults, it helps to know what the inside of a well-made loaf should look like. According to food production notes from IHM, crumb texture should be light, soft, and fluffy, with a network of small, evenly distributed gas pockets formed by a well-developed gluten structure. The crumb color should be creamy white or off-white (depending on flour type), the moistness should be balanced, and the flavor should reflect proper fermentation – mild, slightly complex, and never sour or bland. Any deviation from these characteristics signals a fault somewhere in the process.

Dull or discolored crumb 🔗

A crumb that looks grey, dull, or off-color is one of the most noticeable internal faults. It immediately signals a problem with ingredients or process, even before the bread is tasted.

Causes 🔗

The most common cause is poor-quality or stale flour. The use of old or low-quality flour can lead to grey coloration due to the oxidation of phenolic compounds present in the flour. Flour that has been stored too long loses freshness and can turn bread dull from the inside. Over-fermentation is another major contributor – when dough over-ferments, the resulting bread can contain too much acid, producing a grey or discolored crumb. Conversely, under-fermented dough also produces a dull, dense crumb because the yeast and bacteria have not had enough time to develop. Temperature control plays a role too: dough that is too cold will ferment slowly and result in a grey or gummy-textured crumb, while overly warm dough ferments too quickly, causing discoloration and off-flavors. Even the type of salt matters – using iodized table salt can cause grey crumb and a bitter aftertaste, so non-iodized salts are preferable in bread baking.

Remedies 🔗

Always use fresh, high-protein bread flour stored correctly and used within its recommended shelf life. Monitor fermentation time carefully, adjusting based on dough temperature and environment. Maintain dough temperature in the optimal range of 24°C to 27°C (75°F to 80°F) for consistent fermentation and color. Replace iodized table salt with sea salt or non-iodized alternatives.

Coarse grain and poor texture 🔗

Grain refers to the cell structure visible in the crumb when bread is sliced. A well-made loaf should have a fine, even grain. When the grain is coarse – meaning the cells are large, uneven, and thick-walled – the bread lacks the desired soft, pillowy texture.

Causes 🔗

Under-kneading is one of the primary causes of coarse grain. When dough is not kneaded sufficiently, gluten does not develop properly, resulting in a weak, poorly structured crumb. The sheen of the crumb depends on the gluten formation – kneading increases the number of fine glossy cell surfaces that reflect light, and the greater the web-like gluten structure, the better the reflection. Without this development, the crumb looks dull and feels coarse. Insufficient hydration also contributes, as a dough that is too dry cannot develop an open, tender crumb. Over-fermentation weakens the gluten network – longer fermentation time increases acid production, which weakens the gluten, leading to large irregular holes and a poor crumb structure. On the other side, under-fermentation means gluten has not reached its full extensibility, resulting in a compact, dense, and coarse crumb.

Remedies 🔗

Knead the dough to full development – test this with the windowpane test, where a small piece of dough stretched thin should become translucent without tearing. Ensure the dough has the right hydration level for the flour being used. Monitor fermentation closely: dough should be allowed to ferment until it is ripe but not over-ripe. Using bread flour, which contains a higher amount of protein, results in better gluten-forming properties, leading to doughs that rise well and hold their structure.

Holes and tunnels in the crumb 🔗

Large, irregular holes or tunnels running through the interior of the loaf are among the most visually striking internal faults. While some open crumb is desirable in certain breads like ciabatta, unexpected tunneling in a standard loaf indicates a process problem.

Causes 🔗

A dough made from flour weak in gluten, especially when the yeast content is high, will cause holes because the gluten has little power of gas retention, and the weaker cells will break down during baking. Faulty handling after bulk fermentation destroys gluten elasticity, causing uneven expansion and breakage that results in large holes. Excessive use of dusting flour during shaping is a frequently overlooked cause – excess flour at shaping can prevent the dough from sealing back onto itself, causing tunnels of air to form when baking. Under-proofing is another key culprit: when bread is not proofed long enough, the yeast remains very active in the oven, releasing gases quickly with force, resulting in large gas pockets in the bread. Incorrect dough temperature also plays a role – environments that are too warm cause gases to release prematurely, creating large uneven holes.

Remedies 🔗

Use flour with adequate gluten strength. Develop the gluten network thoroughly during kneading and folding. Use dusting flour sparingly – only the minimum needed to prevent sticking. Ensure the dough is proofed to the correct level before baking: it should spring back slowly when gently pressed. Air must be completely pressed out of the dough during the punching-down and shaping steps to prevent large air pockets from forming. Control dough temperature throughout the process.

Cores, seams, and streaks 🔗

These are denser areas or lines within the crumb that are distinctly different in texture and often inedible. They are evidence of poor technique during dough handling and shaping.

Causes 🔗

The most common cause of cores is the incorporation of hard flour pellets or dough particles into the dough mass. Another common cause is the folding in of a dry skin that forms on the dough surface during proving. Slight over-proving or over-malting can also cause a core near the bottom of the loaf. Seams – dense, heavy, uncooked layers – result from careless handling when loading the dough into the oven. Movement of the dough during early baking destabilizes the delicate structure and can cause collapse, forming a dense seam. Streaks are caused by uneven manipulation in the final stages of dough handling, loose moulding, or insufficient final proof. High-maltose flour can also produce dark streaks in the crumb.

Remedies 🔗

Avoid incorporating dry dough skins into the main dough during folding and moulding. Keep the dough covered during proofing to prevent skin formation. Handle dough gently and confidently during loading – avoid disturbing the oven during the early stages of baking. Ensure thorough and even mixing so no undissolved flour or dough lumps remain. Shape the dough tightly and evenly, placing it seam-side down in the tin.

Damp, close, or clammy crumb 🔗

A crumb that feels wet, sticky, or dense to the touch – even after baking – is known as a damp or close crumb. It affects mouthfeel significantly and often makes bread feel undercooked even when it is not.

Causes 🔗

According to professional baking resources, the common causes include the use of very weak flour, over-machining the dough, and overloading with enriching agents such as fats, sugars, or milk solids. Too much extra flour worked into the dough while folding or shaping can cause dense bread, which translates to a close, underdeveloped crumb. Wrapping bread while it is still warm traps steam and creates a clammy interior. The development of a ropy condition – caused by the spores of Bacillus subtilis bacteria present in flour – also produces a sticky, stringy crumb with an off-putting smell. The ropy condition is not apparent until the bread is some hours old, developing patchiness and a sticky crumb alongside a peculiar odor.

Remedies 🔗

Use flour of appropriate strength for the bread type. Avoid over-mixing, which breaks down gluten and leads to a dense, close crumb. Do not enrich the formula beyond what the recipe requires. Always cool bread completely on a wire rack before wrapping, ensuring steam can escape. To prevent rope, ensure all equipment and the work environment are clean, and avoid using flour that has been stored in warm, moist conditions.

Poor or bland flavor 🔗

Flavor in bread is primarily a product of fermentation. The acids, alcohols, and by-products generated during proper fermentation are what give bread its characteristic depth and aroma. When these are absent or unbalanced, the result is either a flat, bland loaf or an aggressively sour one.

Causes 🔗

Under-fermentation is the leading cause of bland bread – when dough has not fermented long enough, flavor compounds have not developed. Over-fermentation does the opposite, pushing acid production too far and resulting in an excessively sour taste due to high acid content, which also weakens gluten structure. Using low-quality or stale ingredients – particularly old yeast or degraded flour – also robs the bread of flavor. An under-mixed dough, according to the Ardent Mills bread troubleshooting guide, produces a raw dough flavor in the finished loaf because the ingredients have not been properly incorporated and developed.

Remedies 🔗

Give the dough adequate time to ferment – a number of acids, by-products, and alcohols produced during fermentation are responsible for the right flavor in bread, making proper fermentation time essential. Use fresh yeast, checking activity before use if uncertain. Mix the dough fully to ensure even distribution and proper development. Avoid rushing the process – flavor is built over time, not speed.

The role of flour quality in preventing internal faults 🔗

Many internal bread faults trace back, directly or indirectly, to flour quality. Flour varies in grade, gluten content, quality, color, and maltose content – all of which influence fermentation activity, crumb structure, and final color. Weak flour – flour with low protein content – cannot form a strong gluten network. This makes gas retention poor, leading to holes, coarse grain, and structural collapse. Flour that is low in gluten or organic and generic flour can have problems with gluten content and balanced enzymes, affecting crust color and fermentation activity. Always select flour appropriate to the bread being made: strong bread flour with a protein content of 12-14% is best suited for yeast-leavened loaves where structure and volume are critical.

Summary of internal bread faults and their fixes 🔗

Internal bread faults – whether dull crumb color, coarse grain, large holes, dense seams, clammy texture, or poor flavor – all have identifiable causes and correctable remedies. The table below summarizes the key faults covered in this post:

Achieving a consistently good crumb is not about luck – it requires deliberate attention to ingredients, technique, and timing at every stage of bread production. Most internal faults are preventable when bakers understand the science behind what they are doing and maintain disciplined process control from mixing through to cooling.

What do you think? Looking at the faults covered here, which one do you think is most commonly overlooked in a busy bakery environment – and how would you prioritize corrective actions when multiple internal faults appear in the same loaf?

References

1. https://hmhub.in/6th-sem-food-production-notes/bread-faults/
2. https://tableandspoon.com/why-did-my-bread-dough-turn-grey/
3. https://thrivecuisine.com/food-questions/why-is-my-sourdough-bread-grey/
4. https://www.bakingnook.com/why-is-my-bread-gray-in-color/
5. https://chefashii.blogspot.com/2019/04/faults-in-breads.html
6. https://www.yourarticlelibrary.com/home-science/bread/10-common-faults-committed-while-making-bread/86685
7. https://redstaryeast.com/tips-troubleshooting-guide/
8. https://pantrymama.com/sourdough-troubleshooting/
9. https://thebreadguide.com/large-holes/
10. https://thebakingnetwork.com/reasons-dense-dough/
11. https://contentlibrary.ardentmills.com/m/701f8d594fcf65e9/original/Bread-Troubleshooting-Guide.pdf
12. https://doughhowblog.com/2012/10/24/bread-faults-and-their-causes/