Sensory Skills and Olfactory Identification
What you must know
The sensory exams test vocabulary and discipline as much as a nose. Candidates are expected to work fluently with the SCA flavour wheel and with a structured aroma set of 36 reference vials, traditionally organised into four families: enzymatic (fruity, floral, vegetal, herbal), sugar browning (caramel, honey, toasted, nutty), dry distillation (spicy, woody, smoky, resinous), and aromatic taints (chemical, medicinal, phenolic, earthy).
Know the five basic tastes - sweet, sour, salty, bitter, umami - and the distinction between detection threshold (the weakest concentration you can notice) and recognition threshold (the weakest you can name). Most coffee flavour is retronasal: aroma travelling from the mouth to the olfactory epithelium.
Learn the classic defect markers: phenolic/medicinal (over-fermented or contaminated fermentation), ferment/fruity (over-ripe or stalled mucilage), mouldy/musty (storage mould), baggy (jute or burlap), and potato (a raw, earthy note tied to 2-isopropyl-3-methoxypyrazine and Antestia bug damage in East Africa).
Traps
- Over-smelling. Long or repeated sniffs cause olfactory adaptation and blind you to the next sample.
- Confusing sweet with floral or caramel; both smell pleasant but sit in different families.
- Confusing sourness with bitterness. Bitterness lingers; sourness is sharp and fades.
- Naming a specific fruit when the correct answer is the broader family.
Rule of thumb
Two short sniffs, first impression, commit. If identification fails, drop to the family level (enzymatic, sugar browning, dry distillation, taint) rather than freezing. Rinse with water and smell your own sleeve between samples to reset.