Single pot still whiskey

Single pot still whiskey is a style of Irish whiskey made by a single distillery from a mixed mash of malted and unmalted barley distilled in a pot still.[1] Somewhat similar to single malt whiskey, the style is defined by its inclusion of unmalted raw barley in the mash in addition to malt. However, small amounts of raw oats or wheat may have been used at times.[2] This unmalted component is said to give the pot still whiskey a "spicier bristle" and "thicker texture" than the otherwise similar malt whiskeys.[2] If the whiskey is not distilled completely on the site of a single distillery, then it may be termed pot still whiskey but not single pot still whiskey.[3]

Single pot still whiskey
TypeWhiskey
Country of origin Ireland
Alcohol by volume Minimum 40%
ColourPale Gold to Dark Amber

Once the most popular type of whiskey in the world,[2] this style of whiskey was historically referred to as pure pot still whiskey, Irish-style pot still whiskey, or – especially in Ireland – simply as pot still whiskey.[4] The term "single pot still" was only introduced in recent years to overcome the United States Tax and Trade Bureau's objections to the use of the term "pure" in the labelling of food and drink.[5]

The term should not be confused with the theoretical concept of whiskey produced solely in a pot still (which would also apply to single malt whiskey as well as some examples of pot still bourbon and rye whiskey).

Science of pot still distillation

To separate components from a mixture of liquids, the liquid can be heated to force components, which have different boiling points, into the gas phase.[6] The wash is poured into a still, usually made of copper, and heated using steam. The wash consists of many chemicals, malted barley, alcohol, water, and sugar. The alcohol, along with some other chemicals, needs to be separated.[7] By using steam to heat the still, alcohol and some volatile chemicals are evaporated first. As the gas travels upwards, it is directed into another tube around which cold water is constantly flowing. After the gas travels through the cold tube, the gas is condensed back into a liquid and collected in a separate vessel. Depending on how the wash is turned in the still, different chemicals (aldehydes, esters, higher alcohols, and a number of other substances in very small amounts) are evaporated.[7] A rummerger is used to constantly stir the wash to prevent burning of solid particles. After the first wash, there is still 6–7% solids from the barley in the wash.[8] During the heating process, kinetic energy increases (molecules move faster) until they start to change phases. Then entropy increases from the phase change. In the cooling pipe, kinetic energy and entropy both decrease resulting in another phase change from gas to liquid. In this process, not all of the solids are removed and some make it through the first distillation process.[7]

History
A bottle of Redbreast 12 Year Old, bearing the older description "Pure pot still". Newer bottles are labelled "Single pot still".

Whiskey has been distilled in Ireland since at least the 1400s[9] and most likely as early as the 6th century.[3] Single pot still whiskey emerged as a means of avoiding a tax introduced in 1785 on the use of malted barley. Although this tax was repealed in 1855,[10] the popularity of the style endured until the emergence of blends in the late 19th and early 20th centuries.[9]

In the 19th century, single pot still whiskey was the most popular style of whiskey in the world and formed the bulk of Ireland's whiskey exports.[2] However, with the rise of cheaper, milder blended whiskeys in the 20th century, single pot still whiskey declined in popularity, and many formerly all-pot-still brands changed their production to become blends. By 1980, only two specialist bottlings remained in existence, Green Spot and Redbreast, with one in danger of being discontinued.[2] However, in recent years, a resurgence in whiskey distilling in Ireland has led to the launch of several new single pot still whiskeys.[2]

In addition to the general regulations governing the production of Irish whiskey (e.g., geographical origin, aging in wooden casks for a minimum of three years), Irish government regulations stipulate that Irish pot still whiskey must be:[3]

  • Distilled from a mash of a combination of malted barley, unmalted barley, and other unmalted cereals
  • Distilled in a pot still so that the distillate has the aroma and taste of the materials used
  • Made with a minimum of 30% malted barley and 30% unmalted barley

In addition, the regulation documents state that:[3]

  • Up to 5% of cereals other than malted and unmalted barley, such as oats and rye, may be used
  • Either double or triple distillation may be used, although traditionally most Irish pot still whiskey is triple distilled
  • The term "single" can be added if the Irish pot still whiskey is distilled on the site of a single distillery

Whiskeys

As of 2018, there are a handful of single pot still whiskeys on the market. However, due to the construction of several new distilleries in Ireland in recent years, several more single pot whiskeys are expected to be released in the coming years. Those available as of mid-2018 include:

References

Notes
  1. "Irish Whiskey Society Interview". Whisky Cast.
  2. O'Connor, Fionnán (2015). A Glass Apart: Irish Single Pot Still Whiskey. Images Publishing. ISBN 9781864705492.
  3. Technical file setting out the specifications with which Irish whiskey / Uisce Beatha Eireannach must comply (PDF). Food Industry Development Division: Department of Agriculture, Food and the Marine. October 2014. Retrieved 11 August 2020.
  4. "Old Comber 30-year-old whiskey (bottled in 1980s)". The Whisky Exchange.
  5. Hansell, John (26 January 2011). "Pure Pot Still Irish Whiskey Is Now Single Pot Still". Whisky Advocate. Archived from the original on 8 February 2012.
  6. Helmenstine, Anne Marie (2 January 2019). "What Is Distillation? Chemistry Definition". ThoughtCo. Retrieved 25 January 2020.
  7. Hastie, S. H. (1925). "The application of chemistry to pot still distillation" (PDF). Journal of the Institute of Brewing. 31 (2): 198–215. doi:10.1002/j.2050-0416.1925.tb04900.x. Retrieved 25 January 2020.
  8. "The Scottish Pot Stills". Whisky.com. Retrieved 25 January 2020.
  9. Mulryan, Peter (2002). The Whiskeys of Ireland. Dublin, Ireland: O'Brien Press. ISBN 0-86278-751-3.
  10. "Irish Single Pot Still Whiskey Stakes A Comeback". Whisky Advocate. 2020-10-28. Retrieved 2020-11-01.
  11. Murphy, Mark (27 October 2017). "Dingle Distillery's New Small Batch Releases". FFT.ie. Retrieved 13 February 2018.
  12. Bellwood, Owen (30 August 2018). "Teeling to Auction First 100 Bottles of Single Pot Still". The Spirits Business. Retrieved 31 August 2018.

Bibliography
  • O'Connor, Fionnán (2015). A Glass Apart: Irish Single Pot Still Whiskey. Images Publishing. ISBN 9781864705492.
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