The Cut: Heads, Hearts and Tails

Inside the locked glass-and-metal enclosure of the spirit safe, distillate flows towards a decision that helps shape the whisky’s character: keep it for maturation or send it back to the still.[2][6][9] The cut is the distiller’s selection of the heart, or middle portion, of that run. Where it begins and ends matters.[2]

In malt Scotch production, the first runnings and the final portion normally return for redistillation with the next batch of low wines. The heart is collected for the cask.[1]

Where the cut fits into distillation

Malt Scotch is usually distilled twice: first in a larger wash still, then in a slightly smaller spirit still, also called a low-wines still.[1] That second distillation gives the distiller much more control over what goes forward for maturation.

Low wines are the alcoholic liquid produced by the first distillation. An Abertay University and Scotch Whisky Research Institute review puts their strength at 20 to 25% ABV, or alcohol by volume.[4]

The Scotch Whisky Technical File describes the heart as the portion collected once the distiller is satisfied that it has reached the required quality. The foreshots and final feints return for another distillation.[1] The cut is therefore a selection within a continuing flow, rather than the collection of everything leaving the condenser.

For the wider sequence, see how whisky is distilled. The distinction between the first and second distillations is also explained in double and triple distillation.

What heads, hearts and tails mean

Heads, hearts and tails are successive fractions, or portions, of the distillate. They also describe differences in composition and sensory character.[1][2] One term needs particular attention: “feints” has two meanings in the sources.

Congeners are the compounds discussed alongside ethanol when considering a spirit’s aroma and composition. Their changing distribution helps explain why the distiller divides the run instead of treating it as one uniform liquid.[2][3]

In the Scotch Whisky Technical File, “feints” means the final part of the run. Strickland and Maskell’s production survey uses it collectively for heads and tails.[1][2] Before comparing figures or practices, check which meaning the writer intends.

Why the spirit changes during the run

A distillation run delivers a changing mixture, not a neat procession of separate substances. A French experimental and simulation study grouped compounds as light compounds more volatile than ethanol, heavy compounds less volatile than water, and intermediate compounds.[3] Volatility describes their tendency to enter the vapour.

Ethyl acetate and aldehydes concentrated in the earliest fractions. Most higher alcohols peaked during the recycled head fraction or near the beginning of the heart. Acids, 2-phenylethanol and ethyl lactate remained mainly in the boiler until later.[3] Moving the cut therefore changes the mixture retained for maturation; it does not isolate ethanol from everything else.

Alongside these changes in composition, the sources report different strengths for the collected spirit. Each figure belongs with its equipment and study conditions. The French research used a column-topped Stupfler-type still and reported a heart fraction at 75.3% ABV.[3] The Abertay and Scotch Whisky Research Institute review describes the spirit cut for maturation at around 70% ABV.[4]

HMRC’s Spirits Production Manual describes a typical pot still run going to feints when the strength falls to 60% ABV, with spirit in the receiver averaging 68 to 73% ABV.[12] Distilleries vary; these figures are not fixed rules.

Why removing heads does not remove methanol

Separating the heads principally removes aldehydes and ethyl acetate, not methanol, according to the French study. Methanol was present in every distillate fraction and in the residue.[3] A review concerned with fruit spirits likewise describes methanol across almost all pot-still fractions, with accumulation mainly in the tailings.[5]

Those findings correct a persistent misconception about what the head cut achieves. They are descriptions of compound behaviour, not a method for making an unknown spirit safe, and the fruit-spirit findings should not be presented as measurements of whisky.[3][5]

How distillers decide where to cut

Distillers use their senses, instruments and combinations of observations to choose the cut. A 2026 production survey by Strickland and Maskell asked 60 batch whisky distillers in eight countries how they decided where their fractions began and ended.[2] It identified six factors for the heads-to-hearts transition: time, alcohol strength, volume, vapour temperature, sensory assessment and a demisting test.

The demisting test checks whether distillate turns cloudy when mixed with filtered water. For distillers using this approach, the survey describes the transition to clear spirit as the point at which they can make their heads-to-hearts cut.[2] Other distillers use different methods.

Of the 32 respondents relying on a single decision method for that transition, 43.8% used sensory analysis. Volume and ABV each accounted for 18.8%, time for 12.5%, and temperature and demisting for 3.1% each.[2]

Others combined observations: 12 used two factors, 12 used three, and four used four.[2]

The survey records inline thermometers in the vapour path and several ways of measuring alcohol strength: handheld near infrared instruments, pycnometry and glass hydrometers.[2] These give distillers different ways to follow the changing run.

For the heart-to-tails transition, 70.7% of 58 respondents used a single factor.[2] The picture is broader than a distiller working by nose alone: sensory judgement has a substantial role, but measurements and combined observations matter too. The survey reveals varied working methods, not one shared cut point, so a quoted strength belongs with the production account it describes.

The spirit safe: watching and directing the run

The spirit safe originated as a tool for tax assessment and has an additional use in judging the cut, according to the Oxford Companion to Spirits and Cocktails.[6] Its locked glass-and-metal enclosure is a viewing and control point, not storage for finished whisky.

Through the glass, the distiller can monitor spirit arriving from the condenser without touching the liquid. Undiscovered Scotland’s production guide describes hydrometers, a water-cloudiness test and the switching of flow between two receivers.[9]

Each receiver is a vessel collecting the selected flow, but the two serve different destinations. The spirit receiver collects the heart retained for maturation. The low wines and feints receiver collects material intended for redistillation.[1][9] The switch directs the changing liquid towards the cask or another passage through the still.

The enclosure makes that decision visible. Its measurements sit within the broader range of practices recorded in the survey, where distillers may combine strength, temperature, sensory assessment and other factors.[2] The safe provides a place to observe and direct the run; it does not supply one universal recipe for the cut.

Why heads and tails return to the still

Heads and tails still hold alcohol. Returning them to the still is a substantial part of whisky production: in the 2026 survey, 59 of 60 distillers recycled feints in some way.[2] The Scotch Whisky Technical File describes foreshots and final feints returning with the next batch of low wines.[1]

Producers also reported effects on the spirit. Among survey respondents, 61.7% said recycling improved spirit character, 21.7% cited batch consistency, and 11.7% reported an adverse effect.[2] These were producers’ assessments rather than results from a controlled sensory comparison. Recycling is a managed part of production, not a guarantee of one particular flavour.

Of the 59 recyclers, 93.2% said feints volume and character stabilised after enough cycles.[2] The cut therefore reaches beyond the current run. Fractions not selected for maturation can influence subsequent runs, making their management part of the distiller’s continuing work. Low wines and feints follows that return route in more detail.

Where to go next

• Pot Stills Explained: explore the equipment behind batch distillation.
• New Make Spirit: Straight From the Still: follow the selected heart before maturation.
• Distillation Strength and Congeners Explained: examine alcohol strength and the compounds accompanying it.

Sources

[1] Department for Environment, Food and Rural Affairs. Technical File for Scotch Whisky, June 2019.
https://assets.publishing.service.gov.uk/media/5fd36667e90e07662ed92c85/Scotch_Whisky_Technical_File_-_June_2019.pdf

[2] Strickland, M. and Maskell, D. Unravelling the art of feints recycling for whisky: a production survey. Journal of the Institute of Brewing, 132(2), 92 to 100, 2026. DOI: 10.58430/jib.v132i2.99.
https://jib.cibd.org.uk/index.php/jib/article/view/99

[3] Esteban-Decloux, M., Grangeon, H. and Tano, N. G. C. R. Behaviour of volatile compounds during batch multi-stage distillation of whisky: experimental and simulation data. Journal of the Institute of Brewing, 129, 192 to 208, 2023. DOI: 10.58430/jib.v129i3.28.
https://jib.ibd.org.uk/index.php/jib/article/download/28/27/32

[4] Daute, M., Jack, F. and Walker, G. The potential for Scotch Malt Whisky flavour diversification by yeast. FEMS Yeast Research, 24, foae017, 2024.
https://pmc.ncbi.nlm.nih.gov/articles/PMC11095643/

[5] Blumenthal, P. et al. Methanol Mitigation during Manufacturing of Fruit Spirits with Special Consideration of Novel Coffee Cherry Spirits. Molecules, 26(9), 2585, 2021.
https://pmc.ncbi.nlm.nih.gov/articles/PMC8125215

[6] The Oxford Companion to Spirits and Cocktails, edited by David Wondrich, entry “spirit safe”, online dictionary reproduction, edition date not supplied in the fact sheet.
https://spiritsanddistilling.com/dictionary/id/acref-9780199311132-e-672

[9] Undiscovered Scotland. Making Malt Whisky: The Spirit Safe, undated online guide.

[12] HM Revenue and Customs. Spirits Production Manual, SPIR4100, UK Government Web Archive capture, January 2025.
https://www.undiscoveredscotland.co.uk/usfeatures/maltwhisky/spiritsafe.html

This desk-researched article uses the supplied verified fact sheet, distinguishing production guidance, survey responses, experimental findings and guide descriptions.

Last checked: November 2026