Disgorgement (Dégorgement) — à la Glace Technique
How freezing the neck of a Champagne bottle allows clean, precise removal of lees sediment — the cornerstone of traditional sparkling wine production.
Dégorgement à la glace is the process of freezing the neck of a sparkling wine bottle in a brine solution at approximately -25°C, forming a solid plug of sediment that is expelled by internal CO2 pressure when the crown cap is removed. It is now the standard disgorgement method across Champagne, used in both mechanical production lines and by hand for artisanal and prestige cuvées. Understanding the disgorgement date is essential for assessing a Champagne's maturity and aging trajectory.
- The brine solution is maintained at a constant temperature of approximately -25°C to -27°C, forming an ice plug of around 4 cm in the bottle neck that traps the yeast sediment
- A skilled cellar worker disgorging by hand can process around 400 bottles per day; automated mechanical lines operate at thousands of bottles per hour
- Madame Clicquot invented the riddling table (pupitre) in 1816 with her cellar master Antoine de Müller, enabling efficient sediment consolidation before disgorgement
- Bollinger R.D. (Récemment Dégorgé) is one of the few Champagnes still hand-disgorged; it spends a minimum of 13 years on lees and carries a dosage of just 3 g/L
- Dom Pérignon Plénitude releases use extended lees aging: P1 after 8+ years, P2 after approximately 12 to 15 years, and P3 after 30 to 40 years before disgorgement
- Salon Blanc de Blancs, produced only in the finest years from Le Mesnil-sur-Oger, typically ages approximately a decade on the lees before disgorgement; just 43 releases have been made since the house was founded in 1905
- Bruno Paillard was the first Champagne house to print disgorgement dates on back labels, beginning in 1985, a practice now widely adopted across the region
What It Is
Dégorgement à la glace is the removal of yeast sediment from sparkling wine bottles by freezing the sediment into a solid plug in the bottle neck, then expelling it under the wine's natural CO2 pressure. After secondary fermentation and extended lees aging, bottles are stored neck-down so that dead yeast cells consolidate in the neck. The neck is then submerged in a refrigerated brine solution, typically calcium chloride or monopropylene glycol, held at a constant temperature of around -25°C to -27°C. This creates a frozen plug of approximately 4 cm that locks in the sediment. When the crown cap is removed, the internal pressure shoots the plug cleanly out. The technique is today used across all scales of Champagne production, from high-volume mechanical lines to artisanal hand disgorgement for prestige cuvées.
- Brine temperature held at approximately -25°C to -27°C, forming a 4 cm ice plug in the bottle neck
- Sediment expelled by internal CO2 pressure when the crown cap is removed
- Used mechanically at large houses and by hand for prestige or large-format bottlings
- Replaced the older à la volée method, where sediment was removed by hand without any freezing step
How It Works
The process follows directly from riddling (remuage), in which bottles are gradually tilted and turned over weeks so that sediment migrates to the neck. Once inverted neck-down, the bottle neck is plunged into the refrigerated brine bath for the time needed to form the ice plug. The bottle is then turned upright and opened: the pressure inside ejects the frozen sediment plug cleanly, with minimal wine loss. A skilled hand disgorger can manage around 400 bottles per day, requiring steady technique to control the brief moment of pressure release. Immediately after disgorgement, the bottle is topped up with the liqueur d'expédition, a blend of wine and cane sugar that restores volume and sets the final sweetness level. The bottle is then sealed with a Champagne cork and muselet (wire cage).
- Neck immersed in brine at -25°C to -27°C to form a 4 cm sediment plug
- Bottle turned upright and opened: CO2 pressure ejects plug with minimal wine loss
- Hand disgorgers achieve around 400 bottles per day; mechanical lines process far higher volumes
- Liqueur d'expédition added immediately to restore volume and set dosage level before re-corking
The Disgorgement Date and Wine Maturity
Champagne has two distinct lives: one of slow development pre-disgorgement, protected by the presence of lees, and another of more rapid evolution post-disgorgement, once the yeast is removed and oxygen begins to enter through the cork. The disgorgement date is therefore a critical piece of information that tells consumers when the wine's second life began. Bruno Paillard was the first house to print disgorgement dates on back labels in 1985. Late-disgorgement releases, such as Bollinger R.D., Dom Pérignon Plénitude, and Krug Collection, leverage extended lees contact to build complexity and autolytic character before release, offering the combination of freshness and aged depth that defines these wines.
- Pre-disgorgement: slow maturation protected by lees; post-disgorgement: faster oxidative evolution
- Bruno Paillard first printed disgorgement dates on labels in 1985; now common across the region
- Minimum lees aging: 12 months for non-vintage, 3 years for vintage Champagne by appellation rules
- Prestige late-disgorgement cuvées (Bollinger R.D., Dom Pérignon P2, Krug Collection) spend many additional years on lees before release
Famous Late-Disgorgement Cuvées
Bollinger R.D. (Récemment Dégorgé) is among the most celebrated late-disgorgement Champagnes, hand-disgorged after a minimum of 13 years on the lees and finished with a dosage of just 3 g/L. The concept was created by Madame Bollinger, with the 1952, 1953, and 1955 vintages released together in 1967. Dom Pérignon structures its releases around three Plénitude stages: P1 after a minimum of 8 years on lees, P2 after approximately 12 to 15 years, and P3 after 30 to 40 years. Salon Blanc de Blancs, a single-vineyard, single-vintage Blanc de Blancs from Le Mesnil-sur-Oger, is produced only in the finest years and typically spends approximately a decade on the lees before disgorgement. In 43 releases since its founding in 1905, Salon has consistently demonstrated that patience and precision define the house's identity.
- Bollinger R.D.: hand-disgorged after 13+ years on lees; 3 g/L dosage; among the first to print disgorgement date on the label
- Dom Pérignon Plénitude: P1 at 8+ years, P2 at 12 to 15 years, P3 at 30 to 40 years on lees
- Salon Blanc de Blancs: single vintage, single vineyard (Le Mesnil-sur-Oger); approximately 10 years on lees; only 43 releases since 1905
- Krug Collection: mature vintages disgorged and released decades after harvest, with disgorgement date and ID code on label
À la Glace vs. À la Volée
Before à la glace became standard, disgorgement was performed à la volée (on the fly), entirely without freezing. The disgorger held the bottle at an angle, quickly opened the crown cap, and used a skilled flick of the wrist to expel the sediment with the escaping gas, controlling foam with a thumb. This technique required great dexterity and produced more variable results. Today, à la glace is the dominant method at all scales. Large houses run mechanized à la glace lines processing thousands of bottles per hour, while artisan producers and certain prestige cuvées, including Bollinger R.D. and large-format bottles at various houses, continue to disgorge by hand. The choice of hand versus machine reflects production scale and the specific requirements of the wine.
- À la volée: sediment removed by hand without freezing; requires high skill and produces more variable results
- À la glace: freezing the neck creates a clean, consistent plug; now standard at all production scales
- Mechanical à la glace lines handle high volumes efficiently; hand disgorgement used for prestige cuvées and large formats
- Bollinger R.D. and various grower-producers retain hand disgorgement for precision and commitment to tradition
Riddling, Dosage, and the Wider Process
Disgorgement sits near the end of a long production sequence. Riddling (remuage) consolidates sediment into the neck over weeks of daily bottle rotation, a technique pioneered by Madame Clicquot in 1816 with cellar master Antoine de Müller. Once sediment is collected and the plug expelled, the liqueur d'expédition (a mixture of wine and cane sugar) is added to restore volume and determine the final sweetness category, from brut nature to doux. The post-disgorgement rest period is also important: Champagne can feel tight and closed immediately after disgorgement and typically benefits from several months to years of additional bottle rest before reaching its best expression. For late-disgorgement wines with many years on lees, this recovery period is especially significant.
- Riddling (remuage) invented by Madame Clicquot and Antoine de Müller in 1816; now largely automated via gyropalettes
- Dosage (liqueur d'expédition) added after disgorgement; sets sweetness from brut nature (0 g/L) to doux (50+ g/L)
- Post-disgorgement rest recommended before serving: allows wine to recover from the shock of disgorgement
- Long lees-aged wines benefit from proportionally extended post-disgorgement rest before reaching peak expression
Champagnes that have benefited from extended lees aging before disgorgement display pronounced autolytic character: brioche, toasted almonds, hazelnuts, and biscuit notes layered over the primary fruit of the vintage. The mousse tends to be fine and persistent, integrating into a creamy texture that reflects years of yeast contact. When dosage is low, as with Bollinger R.D. at 3 g/L, the palate is dry and precise, with chalky minerality and a long, saline finish. Post-disgorgement, these wines evolve through citrus and orchard fruit freshness toward deeper notes of dried fruit, honey, and spice as oxidative development continues under cork.