The Angels' Share: Where the Missing Whisky Goes

Some barrels in the 2015 George T. Stagg release held only 1 or 2 gallons. Buffalo Trace's account, reproduced by whisky writer Fred Minnick, put the total loss at 84% of the original whiskey. That was evaporation across the barrels' maturation, not a single year's loss.[9]

This is the angels' share: liquid that escapes from a cask while whisky matures. The Scotch Whisky Technical File gives an average annual loss of 2% for Scotch. Both water and alcohol evaporate, and the climate helps determine whether the whisky left behind becomes stronger or weaker.[1][8]

How the angels' share leaves the cask

Oak holds whisky, but it does not seal it away from the world. Spirit permeates the wood, water and alcohol evaporate, and air penetrates the porous oak. The Scotch Whisky Technical File describes this exchange as contributing to the whisky's character.[1]

Evaporation is part of this continuing exchange between cask, spirit and surroundings. For the wider account of what happens between spirit and wood, see how whisky matures in oak.

“Missing whisky” is convenient shorthand, though more than alcohol leaves the cask. Water evaporates too. Laphroaig's own account also lists sulphides among the substances that escape during maturation.[1][13]

The distinction that matters is between volume and strength. A cask can hold less liquid while its contents become stronger, or less liquid while they become weaker. The outcome depends on how much water escapes relative to alcohol.[1]

Why the angels' share is not always 2%

“On average” is the key to the familiar 2% figure. The June 2019 Scotch Whisky Technical File states: “A proportion of the spirit (on average 2%) in each cask evaporates each year.”[1]

That gives a reference point for Scotch, not a forecast for an individual cask. Whisky Advocate's trade glossary identifies heat and humidity as influences on evaporation and says the percentage lost is higher in warmer regions. Scotland's average cannot describe all those conditions.[8]

An annual average also measures something different from the total loss across a maturation. A yearly percentage describes an annual loss; a release account describing losses across the barrels' lives gives the accumulated result. Establish which figure a source gives before comparing it with another.

Ask four simple questions: which whisky, in which climate, over what period, and according to whom? Those details make an evaporation figure useful. Without them, even a precise number can tell us little. For the climatic differences, continue with how climate changes maturation.

Why strength can rise or fall

The Scotch Whisky Technical File describes Scotland's maritime climate as heavily influenced by the Gulf Stream. In these cool, moist conditions, evaporation is slower overall than in warmer, drier climates. The balance of water and alcohol lost determines the direction of the change in strength.[1]

Verdict badge

Verdict: Documented. The Technical File describes strength falling in Scotland's cool, moist climate and rising in warmer, drier conditions, attributing the difference to the relative evaporation of alcohol and water.[1] It gives these climatic directions, not a numerical prediction for each warehouse.

The earliest known source is not reliably established. Source: https://assets.publishing.service.gov.uk/media/5fd36667e90e07662ed92c85/Scotch_Whisky_Technical_File_-_June_2019.pdf. Last checked: November 2026.

Cognac's share

More than 20 million bottles a year: that is the scale of natural evaporation from maturing Cognac, according to the French appellation body INAO. The figure expresses Cognac's annual loss as a bottle equivalent, rather than a percentage loss for whisky.[2]

A striking loss needs its full context

The George T. Stagg account that opens this page shows just how substantial cumulative evaporation can become. It describes the experience of a particular release over its maturation, rather than an annual rate.[9]

Set beside Scotch's average 2% yearly loss, that dramatic account needs its timescale. One figure records the cumulative experience of those barrels; the other gives an annual average for Scotch. They answer different questions, and neither should be read as the other.[1][9]

The fungus associated with escaping alcohol

Evaporated alcohol also helps explain the dark staining associated with some spirit warehouses. Research describes Baudoinia on surfaces exposed to airborne ethanol, including around distilleries and bakeries, and on used whisky barrels. The 2007 research abstract also describes its association with humidity and large daily temperature swings.[3][4]

Its recorded history reaches back well before the current genus name. A 2016 research paper traces the first documentation to Richon and Petit in 1881, including a specimen from affected walls at a spirits distillery in Cognac. They named it Torula compniacensis. Scott and colleagues established the genus Baudoinia in 2007.[3][4]

For a closer look at the organism, see the whisky fungus.

Verdict badge

Verdict: Documented. The warehouse fungus was documented in Cognac in 1881 and placed in the genus Baudoinia in 2007. The 2016 paper records the earlier description; the 2007 paper establishes the genus.[3][4] The 1881 description is known here through later scholarship.

The earliest known source is Richon and Petit, 1881, as traced by the 2016 paper. Sources: https://pmc.ncbi.nlm.nih.gov/articles/PMC5315285/ and https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=18065010&rettype=abstract&retmode=text. Last checked: November 2026.

Neighbours and warehouse staining

Warehouse disputes can also reach the courts, where the reported findings need to be distinguished from the research on staining. In Lincoln County, Tennessee, in 2023, a chancellor ordered work stopped on a Jack Daniel's warehouse after a neighbour sued zoning officials. The reported finding was that the permitting process had not been fully completed. The source checked does not establish the later outcome.[11]

Some spirit remains in the wood

Not all liquid absent from an emptied barrel has evaporated. Some whiskey stays trapped in the oak, according to Jim Beam's published account. Unlike the angels' share, this spirit remains in the wood rather than escaping into the air.[10]

Jim Beam gives no quantity for that retained whiskey. Its account says it agitated emptied barrels to extract trapped bourbon and flavours for Devil's Cut, launched in 2011.[10]

The film named after the angels' share

The name also reached the cinema. Ken Loach directed The Angels' Share, the 2012 film with a screenplay by Paul Laverty. It won the Jury Prize at Cannes that year.[5][6]

Verdict badge

Verdict: Documented. Ken Loach's The Angels' Share won the Cannes Jury Prize in 2012. Cannes lists the film and records the award; no contrary evidence or gap was found.[5][6]

The earliest known source is Festival de Cannes, 27 May 2012. Sources: https://www.festival-cannes.com/en/films/the-angels-share and https://www.festival-cannes.com/en/2012/jury-prize-the-angels-share-by-ken-loach/. Last checked: November 2026.

Why researchers work to reduce losses

Behind the poetic name lies a practical research objective: keeping more spirit in the cask. The Scotch Whisky Research Institute says it examines both cask-based and warehouse-based strategies to minimise maturation losses. Its stated aim is to reduce the resources required to produce a fixed volume of spirit.[12]

The institute also links lower losses with reduced volatile organic carbon emissions from maturation. Its work treats evaporation as something producers can investigate through their casks and warehouses, not an unchanging percentage they must simply accept. It gives no universal target loss rate.[12]

For anyone comparing warehouses, the useful connection is between the vessel and its surroundings. Both belong in the discussion of evaporation. Inside whisky warehouses explores that relationship further; a warehouse type alone does not guarantee a particular loss figure.

Where to go next

• Cask Entry Strength: How Filling Strength Affects Maturation: explore the strength at which spirit begins its time in wood.
• Cask Sizes: Barrel, Hogshead, Butt and Puncheon: understand the vessels behind cask terminology.
• Cooperage: How Whisky Casks Are Made: follow the construction of the cask itself.

Sources

[1] UK Government. Technical File for Scotch Whisky, June 2019.
https://assets.publishing.service.gov.uk/media/5fd36667e90e07662ed92c85/Scotch_Whisky_Technical_File_-_June_2019.pdf

[2] Institut national de l'origine et de la qualité. Cognac Bons Bois, product sheet, undated. https://www.inao.gouv.fr/node/39532/printable/pdf

[3] Scott, J. A., Untereiner, W. A., Ewaze, J. O., Wong, B. and Doyle, D. Baudoinia, a new genus to accommodate Torula compniacensis. Mycologia, 99(4), 592 to 601, 2007. Abstract accessed through NCBI E-utilities, PMID 18065010.
https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=18065010&rettype=abstract&retmode=text

[4] Scott, J. A., Ewaze, J. O., Summerbell, R. C. and others. Multilocus DNA sequencing of the whiskey fungus reveals a continental-scale speciation pattern. Persoonia, 37, 13 to 20, 2016.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5315285/

[5] Festival de Cannes. The Angels' Share, film page, 2012. https://www.festival-cannes.com/en/films/the-angels-share

[6] Festival de Cannes. Jury Prize: The Angels' Share by Ken Loach, 27 May 2012. https://www.festival-cannes.com/en/2012/jury-prize-the-angels-share-by-ken-loach/

[8] Whisky Advocate. Angels' share, trade glossary, undated.
https://whiskyadvocate.com/angels-share

[9] Fred Minnick. Buffalo Trace Announces Antique Collection, 8 September 2015. Trade publication reproducing the producer's release.
https://www.fredminnick.com/2015/09/08/buffalo-trace-announces-antique-collection/

[10] Jim Beam. Jim Beam Establishes Revolutionary Bourbon-Making Process With Release of Devil's Cut, 25 May 2011. Producer's press release via PR Newswire.
https://prnewswire.com/news-releases/jim-beam-establishes-revolutionary-bourbon-making-process-with-release-of-devils-cut-122580388.html

[11] WhiskyCast. Whisky fungus lawsuit halts work on Jack Daniel's warehouse, 2 March 2023. https://whiskycast.com/whisky-fungus-lawsuit-halts-work-on-jack-daniels-warehouse/

[12] Scotch Whisky Research Institute. Optimised Maturation, undated research overview.
https://www.swri.co.uk/our-research/optimised-maturation/

[13] Laphroaig. How to Make Whisky, undated producer's account.
https://www.laphroaig.com/how-to-make-whisky

This desk-researched article uses the supplied verified fact sheet, distinguishing technical documentation, research papers, trade reporting and producers' own accounts.

Last checked: November 2026