Before a roastery commits to buying fifty or a hundred kilograms of green coffee, someone has to answer a deceptively simple question: is this coffee any good? Not “could this coffee be good with the right profile and the right barista on the right day”—but does the raw material have the quality, cleanliness, and character that justify the investment? Sample roasting exists to answer that question. It’s a deliberately constrained form of roasting—small batches, light development, standardized parameters—designed to strip away the roaster’s artistry and let the green coffee speak for itself. The resulting cup isn’t meant to be delicious. It’s meant to be diagnostic.
Purpose and Philosophy
The fundamental purpose of a sample roast is evaluation, not production. When a green coffee trader sends 100-gram samples of a new Kenyan lot, they’re not asking the buyer to produce a finished retail product. They’re asking: does this coffee have the acidity, sweetness, cleanliness, and aromatic complexity that make it worth buying at the offered price? To answer that fairly, the roast has to be neutral—light enough to preserve the coffee’s origin character without adding roast-derived flavors that could mask defects or inflate sweetness.
This philosophy extends beyond purchasing decisions. Sample roasting is also the first step in developing a production profile for a new lot. Once a roastery decides to buy a coffee, the sample roast serves as a reference point—a baseline showing what the green coffee brings to the table before the roaster starts shaping it with profile choices. The sample roast reveals the raw materials; the production profile is the design built on top of them.
The distinction matters because it prevents a common trap: falling in love with a coffee based on a beautifully executed production roast, only to discover after buying the lot that the green itself was mediocre and the roaster’s skill was doing all the heavy lifting. Sample roasting keeps the evaluation honest.
SCA Protocol and Standards
The Specialty Coffee Association provides a standardized framework for sample roasting that the industry has broadly adopted, with some roaster-specific variations. The SCA protocol specifies a light roast completed within 8 to 12 minutes, targeting a roast color measured by an Agtron spectrophotometer in the range of 55 to 65 on the whole-bean scale (roughly Agtron 63 ground, corresponding to a light-to-light-medium roast). The goal is to land just past first crack with minimal development—enough to convert the green coffee’s chemical precursors into tasteable compounds, but not enough to develop the caramelization and Maillard browning that characterize a finished production roast.
Batch sizes are small, typically 50 to 150 grams depending on the roaster. The SCA’s cupping protocol calls for at least five cups per sample, which requires enough roasted coffee to grind approximately 55 grams (8.25 grams per cup at a 1:18 ratio in a standard cupping bowl). Temperature and timing targets are more flexible than many people assume—the 8-to-12-minute window and the color target are the anchors, and experienced sample roasters learn to hit these consistently on their specific equipment.
The SCA has also updated its cupping evaluation standards, adopting the Coffee Value Assessment (CVA) system with separate descriptive and affective assessment forms. The descriptive assessment focuses on identifying flavor attributes objectively, while the affective assessment evaluates quality and preference. Both rely on the sample roast being executed consistently—if the roast varies between samples, the cupping data is compromised.
Sample Roasting Equipment
Dedicated sample roasters are purpose-built for small batches and rapid turnaround. The three most prominent in the professional market occupy distinct niches.
The IKAWA Pro is a hot-air sample roaster that uses digitally programmable profiles, making it exceptionally consistent and essentially hands-free once a profile is loaded. Batch sizes range from 50 to 100 grams depending on the model. Its primary advantage is repeatability—the same profile produces nearly identical results batch after batch, which eliminates roaster variability as a factor in evaluation. Many importers and large roasteries have adopted the IKAWA as their standard sample roasting tool. The downside is limited batch size and the fact that the fluid-bed roasting mechanism produces slightly different results than drum roasting, which can make it harder to translate sample roast impressions directly to a drum-based production profile.
The Probatino, made by Probat, is a miniature drum roaster that behaves like a scaled-down version of a production machine. Batch sizes run from 100 to 250 grams, and the drum mechanism means the heat transfer characteristics are closer to what the coffee will experience in production. It requires more operator attention than the IKAWA but produces results that translate more directly to drum roasting. The Gene Cafe, a home-roasting staple with a rotating off-axis drum, occupies a similar niche for smaller operations—less precise than the Probatino but significantly cheaper, with batch sizes around 200 to 250 grams. The newer Kaffelogic and ROEST machines have also entered this space, offering digital profiling and data logging in compact form factors that compete directly with the IKAWA on repeatability while offering different roasting dynamics.
Regardless of equipment, the key requirement is consistency. A sample roaster’s job is to be invisible—to apply heat in the same way every time so that differences between cups reflect differences in the green coffee, not differences in the roast.
Evaluating the Sample: Defects and Cupping
Once the coffee is sample roasted, it rests briefly—the SCA protocol recommends cupping within 8 to 24 hours of roasting, a much shorter rest window than production coffee because the goal is evaluation, not peak flavor. At this rest period, the coffee has degassed enough for basic extraction but retains the raw, unfinished character that makes defects easy to identify.
Before cupping, the roasted sample is inspected visually for defects: quakers (underdeveloped beans that remain pale due to low sugar content), scorched or tipped beans, foreign material, and inconsistencies in roast color that might indicate uneven green coffee or mixed lots. A high quaker count signals a quality problem in the green—either immature cherries were included in the lot or the drying process was inconsistent.
Cupping itself follows the SCA protocol: coarsely ground coffee is steeped in hot water (93°C/200°F) at a standardized ratio, the crust is broken at four minutes, and evaluation begins as the coffee cools. The sample cupper is looking for specific things that differ from what a production cupper evaluates. Cleanliness is paramount—is the cup free from defect flavors like ferment, phenol, or Rio? Acidity quality and intensity reveal the coffee’s potential for brightness in a finished product. Sweetness indicates sugar development potential. And the aromatic profile—floral, fruity, nutty, chocolatey—tells the buyer what flavors the roaster will have to work with.
What sample cupping cannot do is predict exactly how the coffee will taste as a finished retail product. A sample roast that shows bright citric acidity and jasmine aromatics might become a transparent, floral pour-over or a complex, syrupy espresso depending on the production profile applied to it. The sample reveals potential and identifies problems; the production roast realizes the potential.
From Sample Roast to Production Profile
Translating sample roast impressions into a production profile is more art than formula, but experienced roasters follow recognizable patterns. If the sample cupping reveals high acidity with floral and citrus notes, the production approach will likely emphasize preservation—a relatively fast roast with moderate development (18-22% DTR) to keep those volatile aromatics intact. If the sample shows deep sweetness with chocolate and stone fruit but modest acidity, the roaster might opt for a slower profile with extended development (22-27% DTR) to build body and caramelized sweetness.
The critical insight is that the sample roast tells you what the coffee has; the production profile determines what you emphasize. A sample that shows both bright acidity and good sweetness gives the roaster options—push the profile toward filter clarity or espresso richness. A sample that shows excellent sweetness but flat acidity suggests the coffee is better suited for a medium-development espresso blend component than a single-origin light-roast pour-over. These are decisions the roaster makes after evaluating the raw material, and the sample roast is the evaluation tool that makes informed decisions possible.
The first production roast is always a best guess, refined through iterative cupping. Most roasters plan for two to four test batches before locking a production profile, adjusting charge temperature, gas curves, and development time based on how each iteration cups against the sample roast baseline. The sample roast remains the reference throughout this process—it’s the known quantity against which each production iteration is measured.
What Sample Roasts Can and Cannot Tell You
Sample roasting is powerful but limited, and understanding its boundaries prevents both over-reliance and dismissal. A well-executed sample roast reliably tells you about defect presence, acidity quality and intensity, basic sweetness level, aromatic category (floral, fruity, nutty, spicy), and cup cleanliness. These are the attributes most directly linked to green coffee quality, and they’re largely independent of roast profile choices.
What sample roasting cannot tell you is how a coffee will perform under espresso pressure, what body and mouthfeel the coffee will develop with more Maillard browning, how the flavor profile will shift across a multi-week resting arc, or how the coffee will behave in a blend with other components. These questions require production-level roasting and method-specific evaluation. A sample roast that tastes thin and tea-like might produce a spectacularly juicy espresso with the right development; a sample that tastes heavy and sweet might make a muddy pour-over if roasted too dark. The sample reveals potential, not destiny.
The other limitation is perishability. Green coffee quality degrades over time—six months in a warehouse can dull the acidity and flatten the aromatics that made the sample compelling. If there’s a long gap between sample evaluation and production roasting, the first production batch may not match the sample cupping notes. This is why serious buyers evaluate arrival samples (coffee that has landed at the destination warehouse) in addition to pre-ship samples, and why roasters track green coffee storage conditions carefully between purchase and production.