How Débourbage Works
After pressing, white or rosé must is transferred to a settling tank and left undisturbed for 12 to 48 hours at cold temperatures (5-10 °C). Gravity pulls suspended solids to the bottom, forming a layer of sediment called the bourbes. The clear juice above is then racked off into a clean vessel for fermentation. Temperature control is critical — cold must settles faster and more completely.
Methods and Variations
- Static cold settling — the traditional method; must is chilled and left to settle naturally for 12-48 hours
- Enzyme-assisted — pectolytic enzymes break down pectin chains, speeding sedimentation and improving clarity
- Flotation — nitrogen or air bubbles are injected to float solids to the surface for faster separation; increasingly popular in large-volume production
- Centrifugation — mechanical separation for high-throughput wineries; very fast but can strip some desirable compounds
Impact on Wine Quality
The degree of débourbage directly affects the finished wine's character. Very clean must produces precise, fruit-driven wines with bright aromatics. Leaving some solids (bourbes légères) can add body, texture, and fermentation complexity — a deliberate choice in some Burgundy and Loire Valley whites. Finding the right balance is a key stylistic decision for every white winemaker.