What is the difference between fragrance and aroma in cupping?
In the SCA cupping protocol, fragrance refers to volatile compounds perceived by smelling dry, freshly ground coffee before any contact with water. Aroma is evaluated after brewing: it is what you smell when you break the crust and hot vapours rise from the cup. This dry-versus-wet distinction captures two chemically distinct families of aromatic molecules.
The Specialty Coffee Association cupping protocol deliberately splits olfactory evaluation into two stages, because coffee chemistry shifts dramatically once hot water unlocks new molecular compounds. At the dry stage — fragrance — evaluators smell freshly ground coffee (10 grams per 150 ml, standardised coarse grind) within thirty seconds of grinding. They capture the lightest, most volatile compounds: pyrazines (roasted, nutty notes), aldehydes (fruity, grassy), and simple furans.
After water at 93 °C is poured and four minutes of infusion pass, a crust of floating particles forms. The cupper breaks it with a spoon while leaning their nose over the cup: this is the aroma evaluation moment. The heat releases heavier, less volatile molecules — sulphurous thiols (fresh-roast, onion), phenols (smoky, medicinal), mercaptans — that do not evaporate at room temperature. A fact that surprises many: experienced Q-graders can read potential extraction issues from dry fragrance alone. A muted fragrance on an otherwise correct grind often signals staleness or a roast that has peaked and faded.
On the official SCA cupping form, fragrance and aroma are scored together under a single 10-point attribute, but assessed at separate moments with a 'dry' and a 'wet' checkbox. The final score for this attribute blends both perceptions. It is one of the few points in cupping where evaluators must manage short-term sensory memory: note the dry fragrance, then revise or confirm the assessment after the wet aroma. Roasters frequently use the dry fragrance as a rapid quality check without running a full cupping session — a flat, closed dry fragrance reliably predicts a less interesting cup.
Fragrance vs aroma in SCA cupping
| Parameter | Fragrance (dry) | Aroma (wet) |
|---|---|---|
| Evaluation moment | Immediately after grinding | After crust break, 4-min infusion |
| Coffee state | Dry powder at 20–22 °C | Brewed at 93 °C |
| Dominant molecular families | Pyrazines, aldehydes, light furans | Thiols, phenols, mercaptans, heavy furans |
| Typical descriptors | Roasted, nutty, floral, citrus | Chocolate, smoky, warm fruit, caramel |
| SCA scoring | 'Dry' checkbox (combined attribute) | 'Wet' checkbox (same attribute) |
| Practical use | Fast quality check in roastery | Full evaluation in formal cupping |