The Hic! Whisky Knowledge Base

Exploring the intricacies of whisk(e)y is a journey through landscape, chemistry, and time. This guide provides the technical context behind the terminology found across our collection, helping you navigate the nuances of every dram.

 

1. The Peat Spectrum & PPM

Peat is a natural fuel formed over thousands of years from decomposed organic matter. When burnt to dry malted barley, it releases chemical compounds called phenols. The intensity of the "smoke" is measured in PPM (Phenol Parts Per Million).

  • Measuring Intensity: PPM is measured in the malted barley prior to distillation. Throughout the distillation process and subsequent years in the cask, these phenols gradually break down. Consequently, a long-aged whisky often presents a more integrated, mellowed smoke compared to a younger, high-PPM expression.
  • Unpeated (0–5 PPM): Focuses on the primary characteristics of the spirit—expect orchard fruits, honey, and cereal notes.
  • Medium Peat (15–30 PPM): A sophisticated balance where coastal air and campfire embers complement the distillery’s house style.
  • Heavy Peat (40–60+ PPM): Intense and medicinal, featuring deep, tarry notes of bonfire and seaweed.

2. Cask Maturation & Wood Chemistry

The wood is responsible for up to 70% of a whisky's final profile. As spirit matures, it extracts Lignins (vanilla/spice) and Tannins (structure/dryness) from the oak.

  • Sherry & Port: Oloroso and PX casks provide richness and dried fruit, while Port pipes impart a velvet texture and notes of plum and cocoa.
  • Wine Casks: From Super Tuscans to bold Amarones, these introduce structured tannins and vinous fruit.
  • Mizunara Oak: A rare and expensive Japanese oak (Quercus crispula). It is notoriously difficult to work with but provides a unique aromatic profile often described as sandalwood, incense, and coconut.
  • Virgin Oak: New, charred barrels that offer an intense punch of spice and toasted oak.

3. Calculating Age

The age of a whisky is a strict legal measurement of its duration in the cask.

  • Distillation to Bottling: The clock begins the moment the new-make spirit is filled into an oak cask. It stops the moment the spirit is removed from the wood for bottling. Time spent in the glass bottle does not contribute to the age.
  • The "Youngest Component" Rule: By law, any age statement must represent the youngest spirit in the blend. A whisky distilled in 2001 and bottled in 2026 is a 25-Year-Old. If that same liquid were blended with even a small amount of 10-year-old whisky, the bottle must be labelled as 10 Years Old.
  • NAS (No Age Statement): This allows producers to focus on a specific flavour profile by blending younger, vibrant spirits with older, complex casks without being restricted by a single number.

4. Base Spirits & Global Styles

The foundation of any whisk(e)y is determined by the raw cereals used in the mash and the specific distillation method employed to extract the spirit.

  • Single Malt: Produced at a single distillery using 100% malted barley. These are distilled in batches in copper pot stills, resulting in a complex and robust character.
  • Single Grain: Produced at one distillery but using a variety of grains such as corn, wheat, or unmalted barley. Typically distilled in column stills, these are lighter and sweeter, often providing the "backbone" for famous blends.
  • Single Pot Still (Ireland): A traditional Irish style using a mix of malted and unmalted barley. This results in a distinctively creamy, oily, and spicy texture.
  • Blended Malt: A marriage of single malts from various distilleries. Unlike a standard blend, this contains no grain whisky—it is 100% malted barley, selected to create a harmonious and consistent house style.
  • Blended Scotch / Whiskey: A carefully selected mix of one or more single malts with one or more single grain whiskies. These are designed for balance and approachability.
  • Bourbon (USA): Produced from a mash of at least 51% corn and aged in brand-new charred oak, resulting in a sweet, vanilla-forward profile.
  • Rye (USA/Canada): Produced from at least 51% rye grain, offering a drier, spicier finish with notes of black pepper and clove.

5. Cask Strength

Most whiskies are reduced with water to a standard bottling strength (typically 40%–46%). Cask Strength expressions are bottled exactly as they left the barrel. This preserves the essential oils and esters, allowing the enthusiast to control the dilution and "open up" the bouquet to reveal hidden aromas.