Single malt whisky

Single malt whisky

Single malt whisky is a whisky made at one particular distillery from a mash that uses one particular malted grain, which is ordinarily barley.

Single malts are typically associated with Scotland, though they are also produced in various other countries.[1] Under Scotch Whisky Regulations, a "Single Malt Scotch Whisky" must be made exclusively from malted barley (although the addition of E150A caramel colouring is allowed), must be distilled using a pot still, and must be aged for at least three years in oak casks of a capacity not exceeding 700 litres.[2][3] These constraints may not apply to whisky marketed as single malt that is produced elsewhere. For example, there is no definition of the term single malt in the law of the United States, and some American whisky advertised as single malt is produced from malted rye rather than malted barley.[4]



All single malt goes through a similar batch production process, as outlined below. There are several types of Single Malts available from the distilleries including Single Barrel Single Malts which are the product of a single batch that was stored for 3+ years in a single oak barrel. These single barrel variants afford the opportunity for the consumer to see the inflience of different types of storage on the same whisky (e.g., first use bourbon barrels, port pipes, etc.). The more common form of Single Malt is a marrying at bottling time of various batches that are mixed together or vatted to achieve consistent flavours from one bottling run to the next.


Water is first added to the barley to promote germination and then mixed with ground barley grist to create a mash. Water is also used later in the production process to dilute most whisky before maturation, and added once again before bottling.

Most distilleries use different water sources in the various steps, and this becomes a crucial part of the character of the end product[citation needed].

Most new-make malt whisky is diluted to about 62.5% before it is placed in casks to mature. These days, many distilleries are using distilled water for diluting whisky before it is casked as well as for diluting the whisky to bottling strength (40-46% Alcohol by Volume (ABV)) after maturation. Others, like Jura or Bruichladdich[citation needed] use water from local burns or springs to dilute new-make before it is casked. Much new-make whisky is shipped in tanker trucks to central warehouses where local tap water[citation needed] is used to dilute it before casking, and again at bottling time.

Since large amounts of water are used during the process of whisky production, water supplies are a key factor for the location of any distillery.


Malting floor at Highland Park Distillery.
Malted barley.

Barley, yeast and water are the only ingredients required in the production of (barley-based) single malt whisky.

The barley used to make the whisky is "malted" by soaking the grain in water for 2–3 days and then allowing it to germinate to convert starch (which is insoluble in water and not available for fermentation by yeast) to fermentable sugars.

Traditionally in Scotland each distillery had its own malting floor where the germinating seeds were regularly turned. The "pagoda roof" (many now false) which ventilated the malt kiln can still be seen at many distilleries both in Scotland and in other countries. However, most of the distilleries now use commercial "maltsters" to prepare their malt[citation needed].

Drying in the Kiln

The germination is halted (by heating) after 3–5 days, when the optimum amount of starch has been converted to fermentable sugars. The method for drying the germinated barley is by heating it with hot air produced by an oil, coal or even electric heat source.

The distinctive "pagoda" chimney of a kiln at a distillery in Scotland.

In most cases, some level of smoke from a peat-heated fire is introduced to the kiln to add phenols, a smoky aroma and flavour to the whisky. Some of the more intensely smoky malts have phenol levels between 25 and 50 parts per million (ppm)[citation needed].

The three Scottish malts with a reputation for being the most peaty[citation needed] are Ardbeg, Laphroaig (la-froyg) and Lagavulin (lagga-voolin), all from Islay.

More subtle malts can have phenol levels of around 2–3 ppm.

Entirely non-smoked (non-peated, unpeated) malts are made by the Glengoyne Distillery, who only uses hot air for drying.


The malt is milled into a coarse flour (grist) which is made of three substances: (1) Husks (70%); (2) Grits (20%); and Flour (10%); to which three courses of hot water is added to extract the sugars.

The extraction is done in a large kettle (usually made of stainless steel) called a mash tun. At first, the hot water dissolves the sugars (maltose) and enzymes (diastase) in the grist. Then the enzymes act on the starch left over from the malting stage, continuing the conversion to sugar, and producing a sugary liquid called wort. Typically, each batch of grist is mashed three times or so to extract all the fermentable sugars. The first water is injected at approximately 60-C, the second portion at approximately 72-C and the third and final portion at approximately 88-C. The wort from the first two water courses is drained into Wash Backs for further processing whereas the third course is retained as the first charge in the next batch.


Yeast is used to ferment malted barley in washbacks.

Yeast is added to the wort in a large vessel (often tens of thousands of litres) called a washback. Washbacks are commonly made of Oregon Pine or stainless steel. The yeast feeds on the sugars and as a by-product produces both carbon dioxide and alcohol. This process is called fermentation and can take up to three days to complete. When complete, the liquid has an alcohol content of 5 to 7% by volume, and is now known as wash. Up until this point the process has been quite similar to the production of beer.


The wash, 5%–7% alcohol, is distilled in copper pot stills, boosting the alcohol content to 60%–80%.

The wash is then distilled. The wash is heated, boiling off the alcohol, which has a lower boiling point than water; the vapour is collected and cooled to condense it back into a liquid form.

Scottish regulations require single malts to be distilled in pot stills. In other jurisdictions, column stills may be used.

The initial distilled spirit produced by a pot still, known as low wine has an alcohol content of about 20 to 40%. The low wines are then pumped into a second still, known as the spirit still, and distilled a second, (and sometimes a third) time. The final spirit called "new make spirit" generally has an alcohol content of 60 to 70%.

When a pot still wears out and has to be replaced, or when a distillery decides to expand the number of stills it operates, precise measurements of the existing stills are taken to ensure the new stills are reproduced exactly like the old[citation needed].

Dilution prior to ageing

Most new-make malt whisky is diluted to about 62.5% a.b.v. before it is placed in casks to mature.


The "new-make spirit", or unaged whisky, is then placed in oak casks to mature. By law, all Scotch whisky must be aged for a minimum of three years in oak casks, though many single malts are matured for much longer. The whisky continues to develop and change as it spends time in the wood, and maturation periods of twenty years or more are not uncommon. Each year spent in the wood results in the evaporation of between 1 and 2% of each cask's contents, depending on the ambient conditions at which the casks are stored. Because alcohol is more volatile than water, the alcohol content of the remaining whisky drops over time. This is known as the angel's share.

The selection of casks has a profound effect on the character of the final whisky. For single malts produced within the United States, charred new oak casks must be used.

Reused casks

Outside of the United States, the most common practice is to reuse casks that previously contained American whiskey, as U.S. law requires several types of American whiskey (specifically, all American whiskey labeled as malt, rye malt, rye, wheat, bourbon, or straight whiskey) to be aged in new oak casks.

Bourbon casks impart a characteristic vanilla flavour to the whisky.

Sherry casks are also commonly used. This practice arose because sherry used to be shipped to Britain from Spain in the cask rather than having been bottled, and the casks were expensive to return empty and were unwanted by the sherry cellars.[citation needed] In addition to imparting the flavours of their former contents, sherry casks lend maturing spirit a heavier body and a deep amber and sometimes reddish colour. Stainless steel shipping containers, however, have reduced the supply of wooden sherry casks, to the extent that the Macallan Distillery builds casks[citation needed] and leases them to the sherry cellars in Spain for a time, then has them shipped back to Scotland.

Other casks used include those that formerly held port wine, madeira, rum or cognac.

Vatting, dilution and bottling

To be called a single malt whisky in Scotland, a bottle may only contain whisky distilled from malted barley (or other single malted grain) and produced at a single distillery.

If the bottle is the product of single malt whiskies produced at more than one distillery, the whisky is called a vatted malt, blended malt, or pure malt. If the single malt is mixed with grain whisky, the result is a blended whisky. Single malts can be bottled by the distillery that produced them or by an independent bottler.

The age statement on a bottle of single malt whisky is the age of the youngest malt in the mix, as commonly the whiskies of several years are mixed together in a vat to create a more consistent house style. On occasion the product of a single cask of whisky is bottled and released as a "Single Cask."

While "cask-strength", or relatively undiluted, whisky (often having an alcohol content as high as 60% or higher) has recently become popular[citation needed], the vast majority of whisky is diluted to its "bottling strength" - between 40% and 46% ABV - and bottled for sale.

Chill filtration

Whisky can be "chill filtered": chilled to precipitate out fatty acid esters and then filtered to remove them. Most whiskies are bottled this way, unless specified as unchillfiltered or non chill filtered. Unchillfiltered whisky will often turn cloudy when stored at cool temperatures or when cool water is added to them, and this is perfectly normal. Unchillfiltered, cask-strength whisky is generally regarded as whisky in its purest form[citation needed].

Unlike wine, whisky does not continue to mature in the bottle.


E150A caramel colouring may be added to Scotch single malts prior to bottling,[5][6] to give the whisky a more rich and well-aged appearance. No other additives are allowed in Scotch whisky. This contrasts with the rules governing Canadian whiskey production, which allow the addition of other flavourings as well as caramel, and with the rules governing American whiskey, which do not allow additives in "straight" whisky. The use of the caramel additive must be disclosed when the whisky is sold in some jurisdictions, although not in Scotland itself.[5][6]


Whisky should be stored out of direct heat or sunlight, so as not to undergo evaporation. Corked bottles should be stored upright, avoiding contact between the cork and the spirit inside. The more contact with the cork whisky has, the quicker the cork will disintegrate and/or affect the whisky's taste.


Distillation of whisky has been performed in Scotland and Ireland for centuries. The first written record of whisky comes from 1405 in Ireland, while the production of whisky from malted barley is first mentioned in Scotland in an entry on the 1494 Exchequer Rolls, which reads "Eight bolls of malt to Friar John Cor, by order of the King, wherewith to make aqua vitae.".[1]

Single malt whisky is associated with the Scottish tradition, although there are also Irish and other single malts. Penderyn, the only whisky commercially produced in Wales, is also a single malt.

From the 15th century onwards, whisky was heavily taxed in Scotland, to the point that most of the spirit was produced illegally. However, in 1823, Parliament passed an act making commercial distillation much more profitable, while imposing punishments on landowners when unlicensed distilleries were found on their properties. George Smith was the first person to take out a licence for a distillery under the new law, founding the Glenlivet Distillery in 1824.

In the 1830s, Aeneas Coffey refined a design originally created by Robert Stein for continuous stills which produced whisky much more efficiently than the traditional pot stills, but with much less flavour. Quickly, merchants began blending the malt whisky with the grain whisky distilled in the continuous stills, making the first blended Scotch whisky. The blended whisky proved quite successful, less expensive to produce than malt with more flavour and character than grain. The combination allowed the single malt producers to expand their operations as the blended whisky was more popular on the international market.

Single malt distilleries also exist in the US, England, Canada, the Netherlands, France, Germany, Sweden, Finland, Austria, Switzerland, Wales, Australia, New Zealand, India, Pakistan, Japan and South Africa.[1]

See also


  1. ^ a b c Kosar, Kevin R. (2010). Whiskey: A Global History. London: Reaktion Books. ISBN 1861897804
  2. ^ The Scotch Whisky Regulations 2009, The National Archives, 2009.
  3. ^ The Scotch Whisky Regulations 2009: Guidance for Producers and Bottlers, Scotch Whisky Association, February 12, 2009.
  4. ^ Old Potrero Single Malt Straight Rye Whiskey, Anchor Brewing Company. (Accessed December 2010.)
  5. ^ a b Caramel (E150) or not, Whisky Magazine forum. (Accessed January 2011.)
  6. ^ a b Caramel coloring discussion, Whisky Magazine forum. (Accessed January 2011.)
  • Broom, Dave (1998). Whiskey: A Connoisseur's Guide. London. Carleton Books Limited. ISBN 1-85868-706-3
  • Broom, Dave (2000). Handbook of Whisky. London: Hamlyn. ISBN 0-600-59846-2
  • Erskine, Kevin (2006). The Instant Expert's Guide to Single Malt Scotch. 2nd ed. Richmond, VA: Doceon Press. ISBN 0-9771991-1-8
  • Gabányi, Stefan (1997). Whisk(e)y. Trans. Russell Stockman. New York, NY: Abbeville Press. ISBN 0-7892-0383-9
  • Harris, James F., and Mark H. Waymack (1992). Single-malt Whiskies of Scotland. Peru, IL: Open Court Publishing Company. ISBN 0-8126-9213-6
  • Jackson, Michael (1999). Michael Jackson's Complete Guide to Single Malt Scotch. 4th ed. Philadelphia, PA: Running Press Book Publishers. ISBN 0-7624-0731-X
  • MacLean, Charles (2003). Scotch Whiskey: A Liquid History. London: Cassell Illustrated. ISBN 1-84403-078-4
  • Murray, Jim (2000). The World Whiskey Guide. London: Carlton Books Limited. ISBN 1-84222-006-3
  • Wishart, David (2006). Whisky Classified. 2nd ed. London: Pavilion Books. ISBN 1-86205-716-8

External links

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