How to Taste Whisky

Nosing Whisky: How to Smell It Properly

Professional whisky nosing can begin with a surprising step: diluting the spirit to about 20% ABV. Researchers at the Scotch Whisky Research Institute describe this industry practice as a way to reduce alcohol burn and sensory fatigue, making volatile flavours easier to perceive.[4] The lesson is simple: the strongest sniff is not necessarily the most revealing.

Nosing means smelling whisky before you taste it. Begin above an upright glass without swirling, breathe in gently, then adjust your distance. If alcohol pungency obscures the aromas, try a little water. The aim is to describe what you find, not reproduce somebody else’s tasting notes.[10][3]

Choose a glass that gathers aroma

A tulip-shaped glass gathers aromas where you can explore them. The Scotch Whisky Association recommends the Glencairn for traditional tastings, pointing to its tulip shape. It also describes the copita, based on a Spanish sherry sampling glass, as having a slightly narrowed rim that concentrates aromas.[3]

That concentration includes ethanol. A University of Turku thesis discussing whisky glass design explicitly distinguishes between gathering alcohol vapour and gathering other volatile compounds above the liquid. Approach a narrowed opening gently rather than burying your nose inside it.[10]

There is no need to resolve the question of the perfect glass before you begin. Choose one suitable glass and use it consistently as you learn. Keeping the glass the same lets you concentrate on recognising aromas, rather than changing several things between observations.

Nosing is one part of tasting whisky. For now, the task is straightforward: find a comfortable position where you can smell clearly, then put useful words to the impression.

Nosing whisky: a gentle method

Start with a small measure and an unhurried approach. This sequence adapts the method described by Mald and Vingtier, as summarised in the Turku thesis. The source gives normal evaluation conditions of 18 to 22°C (about 64 to 72°F) and samples of 20 to 40 ml. The smaller measure is enough for this exercise.[10]

Pour 20 ml into a tulip-shaped nosing glass. Keep the whisky at approximately 18 to 22°C (64 to 72°F), following the evaluation conditions reported in the thesis. Leave the glass upright and begin without swirling.[10]
Approach from above. Bring your nose towards the glass gradually. Start around one centimetre above the rim and take a gentle inhalation, not a forceful sniff.[10]
Find a comfortable position. Adjust your distance, moving back if pungency dominates. Try varying your inhalation speed, as the published sequence describes. The aim is a comfortable position that gives you a clear impression.[10]
Write down the first impression. Use your own words before reading another person’s notes. The SWA explains that people pick up different aromas and that describing them becomes easier with practice.[3]
Add one drop of still, unchilled water. Nose again and compare. Treat the drop as a starting point: the Linnaeus researchers described the amount of water as individual.[3][2]
Pause between observations. Repeated sniffing without a break makes the task harder. Continued exposure to an odour lowers sensitivity to it, an effect the thesis discusses in connection with carry-over between samples.[10]

Keep water and food available and take breaks. If you also taste, spitting is normal and nobody needs to finish a glass; these measures do not remove the risks of drinking alcohol. People who are pregnant or trying to conceive, taking medicines that interact with alcohol, living with conditions made worse by alcohol, or recovering from alcohol dependence should not drink. See the Responsible Drinking page for further guidance.

What should you be looking for?

Look for something you recognise, however broad the impression. There is no need to name a precise fruit, flower or spice simply because it appears in a published description. The SWA makes the point plainly: whisky contains a wide range of aromas, people notice different ones, and practice makes them easier to describe.[3]

An ordinary comparison can make a useful first note. Write what the aroma reminds you of, then consider whether a more specific description fits. You can refine that description after adding water or returning to the glass. A note is a record of an observation, not a test with one correct answer.

The whisky flavour wheel helps organise those impressions. Consult it after your first observation, rather than using it as a checklist of things you ought to find. For help turning those observations into a clear record, see writing tasting notes.

Smelling above the glass is orthonasal olfaction. Smell experienced through the route from the mouth is retronasal olfaction, a distinction explored in scholarship on smell as a “dual sense”. Keep these observations separate in your notes: smelling the glass and tasting its contents are different tasks.[9]

Why water can help

The professional dilution described by Baxter and colleagues at the Scotch Whisky Research Institute gives a useful starting principle, not a target for your glass.[4] At home, ask whether a little water helps you smell more clearly. The SWA recommends trying still, unchilled water and describes the resulting release of flavours as the whisky “opening up”.[3]

Sensory research also challenges the idea that water necessarily spoils a spirit’s character. Ickes and Cadwallader found that rums diluted with water to 20% ABV had flavour profiles very similar to those of the original rums. Their study concerned rum, so it does not establish that every whisky responds in the same way.[6]

Comparing a spirit before and after dilution tells you what you perceive. A separate study explored what might happen within the liquid itself. Karlsson and Friedman used molecular dynamics simulations to model water, ethanol and guaiacol, a phenol associated with smoky flavour. At strengths up to about 45% ABV, guaiacol favoured the surface between liquid and air. At 59% ABV or higher, it was driven into the bulk liquid.[1]

The simulations offered a possible explanation for changes in aroma, rather than an ideal dilution recipe. The study used no sensory panel and did not observe guaiacol evaporation; the connection with aroma was the authors’ inference.[1]

Verdict: Documented

Claim: The simulations offered a molecular explanation for adding water.
What the record shows: Guaiacol favoured different locations at different strengths in the simulated mixtures.
Evidence gap: The study did not test sensory perception or observe guaiacol evaporation.
Earliest known source: Karlsson and Friedman, Dilution of whisky: the molecular perspective, 2017.
Source: https://pmc.ncbi.nlm.nih.gov/articles/PMC5561096/
Last checked: November 2026

Record whether you added water and what changed. There is no universal drop count to chase: the researchers gave no general recommendation.[2]

Strength, temperature and the limits of a sniff

More alcohol does not automatically give you more perceptible aroma. In SWRI tests, alcohol burn increased with ethanol concentration. Meanwhile, a musty taint caused by TCA, or 2,4,6-trichloroanisole, was easier to detect in single malt at 20% ABV than at higher strengths.[4]

The same research shows why temperature advice needs context. TCA in neutral spirit and blended whisky was easier to detect at 5°C (41°F) than at about 20°C (68°F). Alcohol burn was highest at 40°C (104°F). These findings concern a particular taint, rather than a general advantage to chilling every whisky for assessment.[4]

Those tests examined what assessors could detect; glass research has also examined where ethanol vapour gathers. Arakawa and colleagues used a camera system to image ethanol vapour above wine. At 13°C (about 55°F), they observed a ring of higher ethanol concentration near the rim of a wine glass, with a lower concentration in the centre.[8]

Here, too, the conditions matter. The experiment examined wine and particular glass shapes. Its findings do not identify one universally correct place to smell whisky or establish the same result for every whisky nosing glass.[8]

Verdict: Documented

Claim: A camera imaged a ring of ethanol vapour near the rim of a wine glass.
What the record shows: Arakawa and colleagues observed the ring with wine at 13°C.
Evidence gap: The experiment did not establish a result for every whisky nosing glass.
Earliest known source: Arakawa and colleagues, A sniffer-camera for imaging of ethanol vaporization from wine: the effect of wine glass shape, 2015.
Source: https://pubs.rsc.org/en/content/articlelanding/2015/an/c4an02390k
Last checked: November 2026

Common mistakes

Inhaling harder when alcohol dominates. Intensity is not the same as information. Tulip-shaped glasses concentrate ethanol as well as aroma, and the published nosing sequence begins above an upright glass without swirling. Move back and inhale more gently.[10]

Treating water as damage. Professional nosing uses substantial dilution, while the rum sensory study found very similar flavour profiles after dilution to 20% ABV. Compare the impressions for yourself rather than assuming the undiluted sample must reveal more.[4][6]

Expecting agreement on every aroma. A shared vocabulary helps people compare observations, but the SWA explicitly recognises that different people pick up different aromas. Describe your impression first, then discuss where it differs from someone else’s.[3]

Keeping your nose at the glass continuously. Continued odour exposure reduces sensitivity. Take a break instead of trying to force another description from an uninterrupted sequence of sniffs.[10]

Where to go next

How to Taste Whisky: The Complete Guide: put nosing into the wider tasting sequence.
The Whisky Flavour Wheel: organise the aromas you recognise.
Writing Tasting Notes: turn observations into a useful personal record.

Sources

[1] Karlsson, B. C. G. and Friedman, R. Dilution of whisky: the molecular perspective. Scientific Reports, 2017.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5561096/

[2] ScienceDaily, reporting Linnaeus University. Why whisky tastes better when diluted with water. 2017.
https://www.sciencedaily.com/releases/2017/08/170818093614.htm

[3] Scotch Whisky Association. Whisky Tasting Toolkit. 2020 edition.
https://www.scotch-whisky.org.uk/media/1714/swa-tasting-toolkit_2020.pdf

[4] Baxter, I., Réveillé, A. and Conner, J., Scotch Whisky Research Institute. Guidelines to optimise the sensory detection of 2,4,6-trichloroanisole in neutral spirit and whisky. Journal of the Institute of Brewing, 2024.
https://pdfs.semanticscholar.org/5f99/af8e656a95e5de452acc819ec89234e9d49c.pdf

[6] Ickes, C. M. and Cadwallader, K. R. Effect of ethanol on flavor perception of Rum. Food Science and Nutrition, 2018.
https://pmc.ncbi.nlm.nih.gov/articles/PMC6021708/

[8] Arakawa, T. et al. A sniffer-camera for imaging of ethanol vaporization from wine: the effect of wine glass shape. Analyst, 2015.
https://pubs.rsc.org/en/content/articlelanding/2015/an/c4an02390k

[9] Wilson, K. A. Individuating the senses of 'smell': orthonasal versus retronasal olfaction. Synthese, publication year not specified in the supplied fact sheet.
https://link.springer.com/article/10.1007/s11229-020-02976-7

[10] Jalo, V. Analysis of volatile aroma-active compounds from a headspace of a novel whiskey glass. University of Turku, master’s thesis, 2022.
https://www.utupub.fi/server/api/core/bitstreams/a41c8385-6537-4d11-9799-bd5320ecfc35/content

This desk-researched guide draws on the supplied verified fact sheet, distinguishing practical guidance, sensory experiments and molecular simulations.

Last checked: November 2026