How Disgorgement Works
After riddling (remuage) collects the yeast sediment in the bottle neck, the neck is plunged into a freezing brine solution at approximately -25 °C. The sediment freezes into a small ice plug within the bottle neck. When the crown cap is removed, internal pressure (5-6 atmospheres) ejects the frozen plug cleanly, with minimal wine loss. The bottle is then topped up with the dosage and sealed with a mushroom-shaped cork and wire cage (muselet).
Manual vs. Automated
- Dégorgement à la volée — the traditional manual method where a skilled worker flips the bottle upside down, removes the cap, and lets pressure expel the sediment in one swift motion. Still used by small grower-Champagne producers
- Automated lines — modern Champagne houses use high-speed disgorgement machines that freeze, uncap, disgorge, dose, and cork hundreds of bottles per hour with precise consistency
Late Disgorgement (Dégorgement Tardif)
Some producers deliberately delay disgorgement for years or decades beyond the minimum aging period. These late-disgorged wines — often labelled "RD" (Récemment Dégorgé), "L.D.", or with a disgorgement date — develop extraordinary autolytic complexity while the yeast plug protects the wine from oxidation. Bollinger R.D. and Dom Pérignon P2/P3 are celebrated examples of this practice.