Extraction
The process of drawing colour, tannins, and flavour compounds from grape skins, seeds, and stalks into the fermenting must during red wine production.
In depth
Extraction is one of the most important variables in red winemaking. The winemaker must decide how much colour, tannin, and flavour to extract — too little produces thin, pale, insipid wine; too much creates harsh, bitter, over-extracted wine with drying tannins.
The main techniques for encouraging extraction are: pumping over (remontage) — pumping juice from the bottom of the tank and spraying it over the floating cap of skins; punching down (pigeage) — manually or mechanically pushing the cap under the liquid; and rack-and-return — draining the fermenting must, letting the cap dry slightly, then returning the liquid.
Extraction is influenced by temperature (warmer fermentation extracts more), duration of maceration (longer = more extraction), the presence of alcohol (alcohol is a better solvent than water for tannin extraction), and the physical manipulation of the cap.
For the exam, understand that winemaking decisions about extraction are directly linked to the intended style: a light Pinot Noir needs gentle, short extraction; a long-lived Barolo needs extensive extraction of noble tannins from fully ripe grapes.
Related exam topics
Frequently asked questions
- What is over-extraction and how does it taste?
- Over-extracted wines have excessive tannin and bitterness from too much skin contact, too high fermentation temperatures, or too aggressive cap management. They taste harsh, drying, and astringent, often with green or stalky notes if tannins were not fully ripe.
- What is the difference between pumping over and punching down?
- Both techniques manage the floating cap of skins during red wine fermentation. Pumping over (remontage) uses a pump to circulate juice over the cap — less disruptive, better for delicate varieties. Punching down (pigeage) manually submerges the cap — more extractive and traditional in Burgundy and for Pinot Noir.
Practise questions on this topic
Use Vinlecta to practise exam-style questions that test your knowledge of extraction and related topics.