Disgorgement

What is Disgorgement? Disgorgement, from the French dégorgement, is the step in traditional-method sparkling wine production in which a compact plug of dead yeast lees collected in the bottle neck is expelled by the wine's own internal CO2 pressure. It happens after riddling has coaxed the sediment down into the neck, and immediately before the bottle is topped up with dosage and sealed with its final cork. The term traces back to the archaic French word gorge, meaning throat, which is exactly where the sediment is gathered before it is fired out. Without this step, a Champagne or Crémant would arrive in the glass cloudy with spent yeast.

How It Works in the Cellar

Two techniques are used. The older dégorgement à la volée, or on-the-fly method, is performed entirely by hand: the cellar worker flips the inverted bottle upright at the precise moment and lets the internal pressure eject the sediment, with no freezing involved. The modern industry standard is dégorgement à la glace, the ice method, in which the inverted neck is plunged into a refrigerated brine bath held at roughly minus 25 degrees Celsius. This freezes a plug of about four centimetres that traps the sediment, so when the temporary crown cap is removed the frozen pellet shoots out cleanly.

During second fermentation and lees ageing, the bottle is sealed with a crown cap fitted with a small plastic cup called a bidule, which catches the sediment and leaves with the frozen plug. Once the plug is gone, the missing volume is replaced with liqueur d'expédition, a mixture of wine and dissolved sugar that also sets the final sweetness category, from brut nature through extra brut, brut and beyond. The bottle is then closed with its definitive Champagne cork and secured by the wire muselet.

Throughput varies enormously by method. A skilled worker disgorging à la volée handles around 400 bottles a day, while modern automated lines run anywhere from 2,000 to 18,000 bottles per hour.

History and Where It Is Used

Systematic disgorgement only became practical thanks to the riddling table, the pupitre, developed in 1816 by Antoine de Müller, cellar master of Veuve Clicquot, working with Madame Barbe-Nicole Clicquot Ponsardin in Reims. By gradually inverting and rotating bottles through remuage, the sediment could be marched down to the neck on a predictable schedule, making the subsequent disgorgement a reliable industrial step.

Today disgorgement is mandatory for every traditional-method sparkling wine: Champagne, French Crémants, Spanish Cava, Italian Franciacorta and Trentodoc, English sparkling wine, and South African Cap Classique. Under Champagne AOC rules, non-vintage cuvées must spend at least 15 months on the lees before disgorgement, and vintage wines a minimum of three years. The much older méthode ancestrale, dating back to 1531, is the exception: those wines are bottled with the lees still inside and require no disgorgement at all.

A specialist category worth knowing is Récemment Dégorgé, or R.D., popularised by Bollinger. These are Champagnes given an extended stay on the lees and disgorged only just before release, often with the disgorgement date printed on the back label so the drinker can judge the wine's freshness against its long maturation.