Roast Defects
Roast defects are quality problems that occur during the roasting process – either because heat was applied incorrectly, because roast variables were not managed carefully, or because poor-quality green coffee was used. They affect the physical appearance of roasted beans and, more noticeably, the flavour and aroma of the finished cup.
Some defects are obvious at a glance: scorched patches on bean surfaces, uneven colour across a batch, or pale undeveloped beans sitting alongside normally roasted ones. Others only become apparent through tasting – a flat, lifeless cup that should have been bright and complex, or an unexpected sourness in what was supposed to be a well-developed roast.
Understanding roast defects helps roasters identify what went wrong during a batch, correct the problem before it repeats, and make better decisions about heat application, roast timing, and quality evaluation. Whether roasting at home or in a commercial setting, recognising defects early is the most practical way to improve the consistency and quality of the coffee you produce.
What Is a Roast Defect?
Physical Defects
Physical roast defects are visible problems with the appearance of roasted beans. These include uneven colouring across a batch, scorched or burned patches on bean surfaces, burned or broken tips, flat or collapsed bean structure, and pale or mottled beans that did not develop fully. Physical inspection is the first step in identifying a problem batch before it reaches packaging or the customer.
Flavor Defects
Physical roast defects are visible problems with the appearance of roasted beans. These include uneven colouring across a batch. Flavour defects are taste and aroma problems that result from incorrect roast development. They include grassiness and raw cereal notes from underdevelopment, bitterness and smokiness from overdevelopment, flat and dull flavour from baking, and sharp or acrid notes from scorching. Some flavour defects are subtle and only apparent through careful cupping; others are pronounced enough to make the coffee unpleasant to drink.ch, scorched or burned patches on bean surfaces, burned or broken tips, flat or collapsed bean structure, and pale or mottled beans that did not develop fully. Physical inspection is the first step in identifying a problem batch before it reaches packaging or the customer.
Roasting Variables
Most roast defects trace back to how roasting variables – time, temperature, airflow, and the rate of heat application – were managed during the batch. Applying heat too aggressively damages the bean surface before the interior has time to develop. Applying too little heat, or allowing the roast to slow or stall, leaves the interior underdeveloped. Poor airflow traps smoke around the beans, contributing to off-flavours. Inconsistent charge temperatures mean different batches start from different thermal baselines, producing different results even when the same profile is attempted. Defects range from minor inconsistencies affecting a small portion of a batch to major quality failures rendering the entire batch unsuitable for use.
Why Roast Defects Matter
Flavor Quality
The most direct consequence of a roast defect is a cup that tastes worse. Defects can mute the natural flavour characteristics of a coffee, introduce unpleasant tastes, or create an imbalance that makes the coffee difficult to brew well regardless of technique.
Consistency
Defects that appear in some batches but not others indicate that the roasting process is not well controlled. Inconsistency is a problem in any setting – home roasters who want reliable results, and commercial roasters whose customers expect the same coffee every time they order.
Customer Expectations
In commercial roasting, a defective batch that reaches customers damages trust. Customers who notice significant changes in flavour – from flat and dull to sharp and acrid – may attribute the problem to their brewing rather than the roast, but the issue remains in the product. Consistent quality control is the practical response.
Roasting Efficiency
Identifying the cause of a defect quickly and correcting it reduces wasted green coffee, time, and energy. A roaster who can read a defect from the roast data and cup evaluation, identify the likely cause, and adjust the next batch accordingly wastes less coffee than one who repeats the same mistake across multiple sessions.
Common Roast Defects Overview
| Defect | Typical Cause | Common Flavor Impact |
|---|---|---|
| Underdevelopment | Insufficient heat or roasting time, causing the roast to end before the beans have fully developed. | Grassy, sour, raw cereal, or peanut-like flavours. The coffee may lack sweetness and complexity. |
| Overdevelopment | Excessive heat application or extending the roast for too long, causing too much flavour degradation. | Overly bitter, smoky, muted, or heavily roasty flavours that overpower the coffee's origin characteristics. |
| Scorching | Excessive surface heat early in the roast, often caused by beans contacting an overheated drum surface. | Acrid, harsh, or charred flavours concentrated on the surface of the bean. |
| Tipping | Excessive heat applied too quickly, causing the tips of the beans to burn before the rest of the bean has properly developed. | Bitter, burnt, and sharp flavours that can increase astringency and reduce cup clarity. |
| Facing | Prolonged contact between the flat faces of the beans and a hot drum surface during roasting. | Localised scorching flavours similar to traditional scorch defects, but concentrated on the bean surface. |
| Baking | A slow or stalled roast progression caused by insufficient energy throughout the development phase. | Flat, dull, and lifeless flavours with reduced brightness and sweetness. |
| Stalling | A reduction or interruption of heat supply at a critical stage of roasting, preventing normal roast progression. | Creates baked characteristics, flat flavours, and uneven development within the batch. |
| Uneven Roasting | Caused by incorrect batch size, drum loading issues, or inconsistent green coffee density within the batch. | Produces mixed flavours in the cup, with some beans becoming overdeveloped while others remain underdeveloped. |
| Quakers | Immature or defective green coffee beans that fail to develop properly during roasting. | Produce peanut-like, papery, or flat flavours and reduce overall cup quality. |
Underdeveloped Coffee
Underdevelopment occurs when roasting ends before the coffee has had sufficient time and heat to complete the chemical transformations that produce a balanced, pleasant flavour. The Maillard reactions and caramelisation processes that drive flavour development require both adequate temperature and adequate time – cutting the roast short leaves these incomplete.
Common Causes
The most common causes are ending the roast too early, using too little heat through the development phase, or dropping the batch before reaching an appropriate internal temperature. Starting with a charge temperature that is too low can mean the entire roast runs behind schedule, compressing development time at the end.
Visual Indicators
Underdeveloped beans are lighter in colour than the intended roast level. They may appear pale or washed out compared to a properly roasted batch. The surface of underdeveloped beans is often less smooth and may retain some of the wrinkled or matte texture of green coffee. In some cases, the interior of the bean – visible when a bean is cut or broken – will be lighter than the surface.
Flavor Characteristics
Underdeveloped coffee typically tastes grassy, raw, or cereal-like, similar to untoasted grain. A pronounced sourness is common – not the clean, bright acidity of a well-roasted coffee, but a sharper, less pleasant sourness. Peanut or legume-like notes are also characteristic. The cup often lacks sweetness and any of the fruit, floral, or caramel notes expected from the coffee at its intended roast level.
Prevention
Extend the development phase – the time between first crack and the end of the roast – to allow the chemical reactions that drive flavour to complete. Monitor bean colour and roast data closely rather than relying solely on time. Sample roasting a new green coffee before full production batches helps establish how much development that particular coffee requires.
Overdeveloped Coffee
Overdevelopment occurs when roasting continues past the point where flavour quality peaks. Beyond a certain development level, the pleasant flavour compounds formed during roasting begin to break down, and new, less desirable compounds accumulate. The result is a coffee that has lost the characteristics that made the green coffee interesting in the first place.
Common Causes
Overdevelopment results from roasting for too long, applying too much heat through the later stages of the roast, or missing the intended drop point. In manual roasting, this often happens when the roaster is distracted or when the rate of roast progression is faster than expected. Excess heat late in the roast accelerates development rapidly.
Visual Indicators
Overdeveloped beans are darker than the intended roast level. At moderate overdevelopment, the surface will be darker and oilier than expected. At more extreme levels, beans may show surface oil regardless of the intended roast style, and colour becomes very dark brown to near-black. The distinction between overdevelopment and correct dark roasting is important: an intentional dark roast is not a defect, but a dark roast that was intended to be medium is.
Flavor Characteristics
The cup from overdeveloped coffee is dominated by roast character – bitterness, smokiness, and a generalised roasty flavour that masks origin characteristics. Acidity is reduced or absent. Sweetness is diminished or replaced by a bitter, charred quality. The coffee often tastes flat in a different way from underdevelopment: rather than lacking flavour, it has too much of the wrong kind.
Prevention
Monitor rate-of-rise data and bean temperature throughout the roast to anticipate when the batch is approaching the target development level. Initiate the drop slightly before the target is reached, accounting for the continued development that occurs during the cooling process. Consistent charge temperatures and batch sizes make the roast more predictable.
Scorching
Scorching is a surface defect caused by excessive heat contact between the bean and the drum surface, particularly in the early stages of the roast when beans are still dense and the drum is very hot. The outer surface of the bean burns before the interior has had any chance to develop, leaving dark patches or streaks on otherwise underdeveloped beans.
Visual Signs
Scorched beans show dark brown or black patches or streaks on parts of the bean surface, while the surrounding surface remains lighter. The pattern is typically irregular and confined to the side of the bean that made contact with the hottest part of the drum. A batch with significant scorching will contain beans at mixed stages of visible development despite being roasted together.
Flavor Impact
Scorching introduces acrid, harsh, and charred notes that are difficult to mask in brewing. Even a small proportion of heavily scorched beans in a batch can affect the overall cup quality. The combination of surface burn character and underdeveloped interior creates a particularly unpleasant flavour profile – simultaneously raw and burnt.
Prevention
Charge temperature – the drum temperature at the moment green coffee is loaded – is the primary variable to manage. A drum that is too hot when beans are loaded causes immediate surface contact burning. Lowering the charge temperature and allowing heat to build more gradually through the early drying phase reduces the risk of scorching. Adequate drum speed also distributes beans more evenly, reducing prolonged contact with any one hot surface.
Tipping
Tipping is a defect in which the narrow tips of coffee beans – the pointed ends – burn before the rest of the bean has developed. Bean tips are thinner and more exposed than the body of the bean, making them more vulnerable to rapid heat application in the early or middle stages of roasting.
Visual Appearance
Tipped beans are easy to identify: the tips appear noticeably darker, sometimes charred, compared to the rest of the bean surface. At mild levels, tipping shows as slightly darkened ends. At more severe levels, the tips are visibly burned or even broken off. Inspecting a handful of roasted beans under good light reveals tipping quickly.
Impact on Cup Quality
Even small amounts of tipping contribute bitter, burnt, and astringent notes to the cup. The tips, being fully burned while the body of the bean is only partially developed, grind into the same brew as the rest of the coffee. The resulting cup typically has a harsh edge that does not resolve as the coffee cools.
Prevention
Tipping is most commonly caused by applying heat too aggressively in the early to middle stages of the roast – particularly through the Maillard reaction phase. Reducing the rate of temperature rise through this section of the roast gives bean tips more time to develop alongside the body of the bean rather than outrunning it. Checking for tipping during and after roasting helps determine whether the heat-application curve needs adjustment.
Facing
Facing is a surface defect similar to scorching, but specifically caused by the flat faces of coffee beans making prolonged or repeated contact with the drum surface rather than tumbling freely through the heated air. It is most common in drum roasters where tumbling action is insufficient to keep beans moving uniformly.
How It Differs from Scorching
Scorching tends to result from the drum being too hot at charge – an immediate, early-stage burn. Facing occurs throughout the roast when beans are not moving enough, so the same surfaces repeatedly contact the drum. The visual result is similar – dark patches on bean surfaces – but facing marks tend to correspond more directly to the flat face of the bean rather than appearing as random streaks.
Visual Indicators
Faced beans show darkened or flattened patches on the broad face of the bean, which may appear more uniformly discoloured on one side than a scorched bean. In a batch with significant facing, many beans will show similar discolouration on the same surface.
Flavor Consequences
Like scorching, facing contributes harsh, acrid, and charred flavour characteristics. The flavour impact depends on how severe the facing is – moderate facing adds a bitter edge; severe facing produces a markedly unpleasant cup with noticeable burnt or acrid notes. The underlying coffee flavour is compromised alongside the surface defect.
Baking
Baking describes a condition in which coffee develops a flat, dull, and lifeless character in the cup despite appearing visually normal after roasting. It is caused by slow or stalling roast progression – insufficient energy being delivered to the beans through the development phase, even if the total roast time is normal or even long.
Slow Roast Progression
A baked roast is not simply a slow roast – it is one where the rate of temperature rise flattens out or slows significantly during the Maillard reaction phase, depriving the beans of the sustained heat energy needed to drive flavour development. The beans may reach the intended final temperature, but they have effectively coasted there rather than developing through it.
Flavor Characteristics
Baked coffee lacks the brightness, sweetness, and complexity that the green coffee’s quality might suggest. The cup tastes flat, hollow, and without dimension. Acidity is suppressed. Sweetness is absent or very low. The overall impression is of coffee that has had its character removed rather than developed – not obviously wrong in any one direction, just empty. This makes baking one of the harder defects to identify without direct comparison to a well-roasted version of the same coffee.
Prevention
Maintaining a positive rate of rise through the development phase is the primary prevention strategy. If the rate of temperature increase begins to flatten, adding heat – carefully, to avoid overshooting – can help restore momentum. Avoiding excessively long total roast times and not dropping heat application too aggressively mid-roast both help. Roasters using data logging tools can identify a flattening rate of rise before it produces a fully baked result.
Stalling
Roast stalling occurs when the temperature progression within the drum halts or reverses at a critical point during the roast – most problematically during development, after first crack. A stalled roast is closely related to baking but has a more specific cause: an interruption or significant reduction in heat supply at a point when the roast requires sustained energy to proceed.
Why It Happens
Stalling can result from charging too large a batch for the roaster’s heat capacity, dropping gas pressure too aggressively in an attempt to slow the roast, or an equipment malfunction that reduces burner output. Damp or high-moisture green coffee absorbs more energy in the drying phase, which can leave less available for later development and contribute to stalling behaviour.
Impact on Development
When a roast stalls during or just after first crack, the coffee continues to lose moisture and change physically, but stops developing flavour at the rate needed. The result is a coffee with baked character – flat, dull, lacking sweetness – and potentially uneven development across the batch.
Correction
If a stall is identified during the roast, carefully restoring heat can sometimes recover the batch, though the flavour result will not be identical to a normally progressed roast. The more reliable response is prevention: understand the roaster’s capacity limits, avoid overcrowding the drum, and be cautious about large gas reductions once development has begun. Reviewing roast data after a stall helps identify where the issue occurred and how to adjust the approach for the next batch.
Uneven Roasting
Uneven roasting occurs when beans within a single batch reach different stages of development at the end of the roast. Some beans may be properly developed, while others are underdeveloped or slightly overdeveloped. The result is a batch with mixed colour and, more importantly, mixed flavour characteristics.
Contributing Factors
Uneven roasting can have several causes. Overfilling the drum reduces the tumbling action that keeps beans moving through the heat evenly. A drum speed that is too slow has the same effect. Significant variation in the density and moisture of the green coffee means that different beans behave differently under the same heat conditions. Green coffee that has not been cleaned or sorted effectively may include beans of different sizes, making even heat distribution harder to achieve.
Roasting and Green Coffee Influences
On the roasting side, charge temperature, drum speed, and batch size all affect how evenly heat reaches each bean. On the green coffee side, density variation, moisture inconsistency, and the presence of very small or very large beans in the same batch contribute to uneven development. Neither side alone typically causes the problem – unevenness usually reflects a combination of factors.
Effects on Flavor Consistency
A batch with uneven development produces a cup with confused, mixed flavours – some of the brightness and acidity from underdeveloped beans alongside the bitterness and flatness from overdeveloped ones. The overall impression is a muddled, inconsistent cup that does not represent the coffee well at any roast level. When ground together, beans at different development stages produce a brew that neither highlights the best of the coffee nor clearly identifies a specific roast character.
Quakers
Quakers are underdeveloped beans that appear in a batch of roasted coffee – lighter in colour than surrounding beans, with a wrinkled or matte surface – that failed to develop during roasting, not because of a roasting error, but because of a problem with the green bean itself. They are caused by immature or poorly processed green coffee rather than roasting mistakes.
Why They Occur
Quaker beans come from coffee cherries that were picked before full maturity, or from beans that were not fully fermented or processed correctly. Immature beans have a different cellular structure and sugar composition from ripe beans, which means they do not undergo the same Maillard reactions and caramelisation during roasting. No amount of additional roast time corrects this – they simply do not develop in the same way as properly ripened beans.
Visual Identification
Quakers are most visible after roasting: they remain noticeably lighter than the surrounding beans in a batch, often appearing pale tan or light brown while the rest of the batch is medium or dark brown. Their surface tends to be less smooth and more wrinkled than that of properly developed beans. They become more visible as roast level increases, since the contrast between their pale colour and the darker surrounding beans becomes more pronounced.
Flavor Contribution
Even a small number of Quakers in a batch can affect cup quality. They contribute peanut-like, papery, and flat flavour notes that do not belong in the intended flavour profile. In specialty coffee, quakers are considered a significant quality problem because they cannot be corrected during roasting – they must be removed.
Sorting Practices
In commercial specialty roasting, quakers are removed by hand-sorting roasted coffee under good light before packaging. In larger operations, optical sorting machines identify and reject pale beans automatically. Addressing Quakers at the green coffee buying stage – purchasing from sources with good sorting and processing practices – reduces their frequency in production batches.
How Roasters Identify Roast Defects
Visual Inspection
Examining a sample of roasted beans under good light is the first and most immediate way to identify physical defects. Spread a small quantity of beans on a white surface and look for uneven colour, dark patches, burned tips, pale or mottled beans, or unusual surface texture. Visual inspection takes only a few minutes and catches many obvious problems before coffee reaches the grinder.
Color Consistency
Within a properly roasted batch, colour should be reasonably consistent across beans. Significant colour variation – some beans noticeably darker or lighter than the majority – indicates uneven development, the presence of quakers, or surface defects such as scorching or tipping. Colour measurement tools used in commercial settings provide objective, repeatable colour scores that can be compared against target values.
Roast Data
For roasters using data logging software, the stored roast curve is a direct record of what happened during the batch. A flattening rate of rise indicates baking risk. An unusually steep early temperature curve may suggest scorching conditions. Comparing the actual curve against the target profile shows where the batch deviated and helps diagnose the likely cause of any defect found during evaluation.
Coffee Cupping
Cupping – preparing and tasting coffee using the standardised evaluation method – is the most reliable way to identify flavour defects. A cupping session on a sample from each production batch (or from batches where visual inspection or roast data raised concerns) gives the roaster direct sensory information about what the coffee actually tastes like. Many defects that are not obvious from roast data or visual inspection are immediately apparent in the cup.
Sample Evaluation
Comparing a questioned batch against a reference sample – a batch known to be correct – makes flavour defects easier to identify. Side-by-side cupping highlights differences in acidity, sweetness, body, and overall character that might be missed when evaluating a single coffee in isolation. This approach is particularly useful for identifying baking and subtle underdevelopment.
Roast Defects and Flavor
| Defect | Typical Flavor Characteristics |
|---|---|
| Underdeveloped | Grassy, raw cereal, or peanut-like flavours with sharp sourness and limited sweetness. Coffee lacks caramelisation and fruit development. |
| Overdeveloped | Overly bitter, smoky, roasty, or muted flavours. Origin characteristics become difficult to identify and may develop charred or ashy notes at extreme levels. |
| Baked | Flat, dull, or hollow flavours with suppressed acidity and little sweetness. Coffee lacks brightness and complexity, with mild cases sometimes showing cereal-like characteristics. |
| Scorched | Acrid, harsh, and charred flavours with a persistent bitter edge that does not soften as the coffee cools. Often accompanied by unpleasant astringency. |
| Uneven Roast | Mixed and conflicting flavours in the cup, often combining sour and bitter characteristics. The coffee lacks the balanced profile expected from a consistent roast level. |
| Quakers | Peanut, papery, or straw-like flavours that reduce overall cup clarity. These beans introduce unwanted flatness that does not align with the intended roast profile. |
Common Causes of Roast Defects
| Cause | Potential Defects |
|---|---|
| Excessive Heat | Scorching, tipping, facing, and overdevelopment. Excessive heat can cause surface damage before the interior of the bean has enough time to develop properly. |
| Insufficient Heat | Underdevelopment, baking, and stalling. Beans do not receive enough energy to complete proper flavour development during the roast. |
| Poor Airflow | Smoke accumulation around the beans contributes to flat, smoky, and undesirable flavour characteristics. Poor airflow can also contribute to uneven development. |
| Inconsistent Charge Temperature | Creates batch-to-batch variation, causing the roast to progress differently even when following the same profile. Errors in charge temperature can increase the likelihood of scorching or baking depending on the direction of the variation. |
| Poor Bean Quality | Quakers from immature green coffee and other green coffee defects may carry through the roasting process regardless of technique or roast adjustments. |
| Incorrect Batch Size | Overfilling the drum can restrict bean movement and create uneven roasting, while undersized batches may cause the roast to progress too quickly and inconsistently. |
| Poor Roast Control | Late corrections, missed drop points, or inattentive monitoring can create any type of roast defect depending on the timing and direction of the error. |
Preventing Roast Defects
Consistent Batch Sizes
Roasting the same weight of green coffee in each session makes the roast more predictable. When batch size changes significantly, the amount of energy the roaster needs to deliver changes with it – and a profile developed for one batch size will not behave the same way at a different weight. Work within a consistent range and develop profiles specific to the batch sizes you use regularly.
Monitoring Roast Progress
Staying attentive through the entire roast – rather than setting variables at the start and checking back at the end – allows problems to be caught and corrected before they produce a defective batch. Watch for a flattening rate of rise during development, listen for the timing and character of first crack, and visually check bean colour and surface condition through a sample door or trier if the equipment allows.
Controlling Heat Application
Apply heat in a way that moves the roast progressively through its stages without sudden jumps or extended flat periods. Early heat drives moisture evaporation; mid-roast heat drives the Maillard reactions and colour development; heat through development determines how completely the coffee develops. Reducing heat too aggressively at any point risks baking or stalling; maintaining too much heat risks surface damage and overdevelopment.
Managing Airflow
Adequate airflow removes moisture and combustion gases from the roasting environment, preventing smoke from accumulating around the beans during development. Most roasters benefit from more airflow through the latter half of the roast and during cooling. Experimenting with airflow settings and noting their effect on cup quality helps build a clearer understanding of how this variable interacts with the others.
Keeping Roast Records
Documenting each roast – batch size, charge temperature, key temperature milestones, gas and airflow adjustments, drop time, and any observations about the batch – creates a reference for troubleshooting. When a defect appears, roast records allow it to be traced back to a specific batch and a specific set of conditions. Over time, records reveal patterns that improve roast decision-making.
Evaluating Coffee Through Cupping
Regular cupping of production batches is the most direct way to catch flavour defects before they accumulate. Cupping does not need to be elaborate – a simple evaluation of aroma, acidity, sweetness, body, and finish on a sample from each batch takes fifteen to twenty minutes and provides immediate feedback on roast quality. For home roasters, tasting methodically and comparing batches against each other builds the sensory reference needed to identify problems early.
Roast Defects vs Green Coffee Defects
| Category | Roast Defects | Green Coffee Defects |
|---|---|---|
| Origin | Occur during the roasting process itself after the green coffee has been purchased. | Present in the green coffee before the roasting process begins. |
| Cause | Caused by errors in heat application, roast timing, airflow management, or overall roast control. | Caused by issues such as immature harvesting, processing failures, poor storage conditions, insect damage, or fermentation faults at origin. |
| Identification | Identified through roast data analysis, visual inspection of roasted beans, and evaluation of the final cup quality. | Identified through green coffee grading and inspection before roasting. Some defects carry through to the roasted bean, such as quakers, while others are primarily detected through cup evaluation. |
| Correction Possibilities | Can often be addressed by adjusting roasting technique, profile parameters, airflow, heat application, or equipment settings. | Cannot be corrected through roasting. Prevention requires better sourcing, sorting, quality control, or rejecting affected green coffee. |
Key Roast Defect Terms
| Term | Meaning |
|---|---|
| Underdevelopment | A condition where roasting ends before the coffee has undergone sufficient chemical development, resulting in grassy, sour, or raw flavour characteristics. |
| Overdevelopment | A condition where roasting continues beyond the peak of flavour quality, producing bitter, smoky, or muted flavours while suppressing the coffee's origin characteristics. |
| Scorching | Surface burning of the bean caused by excessive heat contact early in the roast. Scorching creates dark patches on the bean and contributes harsh, acrid flavours. |
| Tipping | Burning of the narrow tips of coffee beans caused by applying heat too rapidly. This results in bitter and astringent flavours in the finished cup. |
| Facing | Localised surface burning on the flat face of a bean caused by prolonged or repeated contact with the roasting drum surface. It is similar in effect to scorching. |
| Baking | A flavour defect characterised by flat, dull, and lifeless cup qualities. It occurs when slow or stalled roast progression fails to provide enough energy during development. |
| Stalling | An interruption or significant reduction in temperature progression during roasting, particularly problematic when it occurs after first crack. Stalling is closely associated with baked flavours. |
| Quaker | An immature or defective green coffee bean that fails to develop properly during roasting. Quakers remain pale and contribute peanut-like, flat, or papery flavours to the cup. |
| Roast Defect | Any physical or flavour issue in roasted coffee caused by an error, inconsistency, or suboptimal condition during the roasting process. |
| Roast Consistency | The ability to produce multiple batches of roasted coffee with consistent flavour, colour, and physical characteristics across different roasting sessions. |
A Final Note
This guide is part of the Cafe do Paraiso Coffee Education Library. For broader context on the roasting process, visit the main Coffee Roasting Guide.