Vertical tasting

Definition

Vertical tasting is a form of whisky tasting in which one evaluates a single whisky expression across multiple different vintages or bottling moments. The aim is to record how aging and the aging process affect the expression over time, and how color, aroma, and flavor change with increasing age.

Purpose and applications

• To document changes in aroma, taste, and finish over time for a given expression.
• To illustrate the effect of cask maturation, bottling moment, and average age on sensory characteristics.
• To provide sensory analysts, collectors, and bottlers with a basis for comparison between vintages and bottling runs of the same whisky.
• To be a valuable tool in evaluating storage strategies and quality monitoring of the portfolio.

Preparation and materials

• Select a single whisky expression and at least 3–5 vintages or bottling moments, where the same expression is represented.
• Ensure the samples come from separate bottlings to avoid mixing due to bottle variation.
• Use uniform glassware (e.g., tulip-shaped glasses) and consistent ambient conditions (room temperature around 18–22 °C, no strong daylight).
• Prepare a standardized notes template and a color scale for recording color and color harmonies.
• Have suitable water or mouthwash to rinse the palate between samples.

Method

• Pouring and order: Many choose to start with the youngest vintage and move toward older vintages, but others prefer starting with the oldest to follow the development. Choose a consistent order for all sessions.
• Serving size: Typically pour 15–30 ml per sample to ensure sufficient aroma and taste sample for evaluation.
• Setup and aeration: Let the glass rest briefly (1–2 minutes) after pouring to release aromas; a light swirl of the glass can help sharpen the aroma.
• Sensory evaluation:
• Color and appearance: Note color intensity and clarity.
• Nose experience: Note primary and secondary aromas (grain, fruit, spice, wood, sherry notes, smoke, mineral notes).
• Palate and structure: Assess sweetness, acidity, body, tannins, alcohol warmth, and mouthfeel.
• Finish: Length, warmth, development, and aftertaste (retro-nasal).
• Documentation: Use a common form to record aroma profile, taste notes, intensity scale (e.g., 0–5), and finish length scale (e.g., short/medium/long).
• Data handling: Compare vintages by establishing parameters such as color intensity, dominant aromas, and changes in body/structure over time.

Sensory expectations and characteristics

• Color and integration: Older vintages often show a deeper color and a more integrated harmony between wood and spirit, but individual cask-selected phenotypes can vary considerably.
• Aroma development: Younger vintages may be more fruity and crisp, while older vintages often develop more complex spicy, oak-vanilla, and tea- or sherry-like notes, depending on cask and bottling moment.
• Taste and mouthfeel: Worth noting changes in sweetness, acidity, and tannins; older samples may show a rounder body and more integrated oak notes.
• Finish: Older vintages can end with longer, spicier or sweeter finishes, while younger samples often have a more vibrant, fresh finish.
• Variation patterns: Variation between vintages can occur due to differences in raw materials, distillation equipment, bottling months, and seasonal production conditions. It is not uncommon for some vintages to retain more fruit, while others yield more oak/spice- or sherry-influenced profiles.

Documentation and data

• For each vintage, specify: expression, distillery, bottling year, age of the vintage at bottling, alcohol strength (ABV), cask type (if known), any finish notes (e.g., ex-bourbon, ex-sherry).
• Record contextual conditions: bottling regime (single bottle vs. batch), storage conditions, and any bottling adjustments.
• Develop a comparative table or graphic overview showing changes in key parameters over time (e.g., color intensity, aroma and flavor notes, finish length).

Practical tips and execution

• Blind tasting can increase objectivity; if possible, conduct sessions without knowing the vintage name, especially brand-identifiable labeling.
• Replicates: Use multiple samples of the same vintage (if available) to assess consistency and reduce bottle-to-bottle variation.
• Note contextual factors at each session (temperature, glass distance, pouring time) to minimize bias.
• Consider supplementing with a horizontal assessment (different expressions) to provide a broader understanding of how vintage affects an individual expression compared with other products.

Challenges and sources of error

• Bottle diversity and blending: Variation between bottles in the same vintage can affect results, especially if bottling times differ or if there are bottling variations.
• Cask type and strength: Differences in cask maturation (type, age, previous contents) can color the interpretation of older vintages and make direct comparison more complex.
• Alcohol strength: Changes in ABV between bottling moments can affect perception of body and warmth; adjust with water if necessary.
• Forgotten contextual notes: Without systematic documentation small changes in storage conditions or glass shape can influence judgments.

Example layout template (sketch)

• Vintage 1: [name], bottling year, ABV, cask type, notes (aroma, taste, finish), intensity (0–5).
• Vintage 2: [name], bottling year, ABV, cask type, notes, intensity.
• Vintage 3: [name], bottling year, ABV, cask type, notes, intensity.
• … and so on.

Summary

Vertical tasting provides insight into how a given whisky expression evolves with aging over the years. By systematically documenting aromatic and flavor changes across vintages, you gain an understanding of how the maturation processes and the resulting overall characteristics shift over time. This can be particularly valuable for bottlers and collectors who want to evaluate aging strategies, quality over time, and potential value-creating patterns within a portfolio.