noun From Latin macerare (to soak, soften); in winemaking, adopted in the 19th century to describe skin contact during fermentation

Maceration /ˌmæsəˈreɪʃən/

The process by which grape skins (and sometimes seeds and stems) remain in contact with the juice or fermenting wine, transferring colour, tannin, flavour compounds and aromatic precursors into the liquid. In red winemaking, maceration is essential: it extracts anthocyanins (colour), tannins, and flavour compounds from the skins during and after fermentation. In white winemaking, maceration is usually avoided to preserve freshness; when deliberate (skin-contact or orange wine), it adds tannin, texture and complexity. Duration ranges from hours (for delicate rosé or light reds) to months (for traditional Nebbiolo, orange wine).

Five types of maceration

Type Timing Effect

Cold soak / cold maceration Pre-fermentation (3–5°C) Extracts colour and aromatic compounds without tannin. Used in Pinot Noir production to build colour depth before fermentation begins.

Fermentation maceration During alcoholic fermentation Alcohol increases extraction efficiency. The standard maceration for most red wine. Duration: 7–30 days typical; 60+ days for traditional Barolo.

Extended maceration Post-fermentation (cap submerged) Continues extraction after fermentation. Increases tannin and structure. Used in traditional Barolo, Brunello, some Rhône reds.

Carbonic maceration Whole-cluster, CO₂ environment Intracellular fermentation before crushing. Preserves fresh fruit, low tannin, high colour. Classic technique for Beaujolais.

Skin-contact (white / orange) During fermentation (white grapes) Extracts tannin, colour and phenolics from white grape skins. Produces amber/"orange" colour. Days to months depending on style.

Cap management

During fermentation, CO₂ bubbles push grape skins to the surface of the fermentation vessel, forming a floating cap (chapeau or pomace cap). If left undisturbed, this cap dries out and extraction stops — and unwanted bacterial spoilage can begin. Winemakers manage the cap by: punching down (pigeage) — breaking the cap manually or mechanically and submerging it into the wine; pumping over (remontage) — pumping fermenting wine from the bottom of the tank and spraying it over the cap; or rack and return (délestage) — draining the wine off the skins and returning it. Each technique extracts differently: punch-down is gentle but requires close monitoring; pump-over is efficient for large volumes; rack and return produces a softer extraction. The choice shapes tannin quality as much as maceration duration. See how wine is made for the full fermentation context.

Maceration in white and orange wine

Conventional white winemaking avoids maceration: grapes are pressed immediately to preserve freshness, and the juice is fermented without skin contact. When winemakers deliberately allow skin contact for white grapes — from a few hours to many months — the result is skin-contact or orange wine. The longer the maceration, the more tannin and colour extracted, and the less the wine resembles a conventional white. Short skin contact (4–6 hours) adds texture and phenolic grip without changing colour dramatically. Extended maceration (months in qvevri, as in the Georgian tradition) produces deep amber, tannic wine with an oxidative, complex character. See orange wine market growth for how skin-contact whites are performing in the current market.

Sources: WSET (maceration and red wine production curricula, Level 3); AWRI (Australian Wine Research Institute) (maceration research and extraction studies); Jancis Robinson MW (Oxford Companion to Wine, maceration entry). Last updated: 2026-10-21. Corrections via the contact form.

Questions

About maceration.

What is the purpose of maceration in red wine?

Maceration is what makes red wine red — and what gives it structure. All red colour in wine comes from anthocyanins in grape skins; the juice alone is colourless or very pale. During maceration, the fermenting wine dissolves these anthocyanins along with tannins, aromatic compounds (pyrazines, esters, terpenes), glycerol and other polyphenols. Without maceration, red grapes produce white wine. The length of maceration determines how much is extracted: a 7-day maceration for Pinot Noir produces a delicate, pale wine; a 60-day maceration for Barolo (traditional method) produces a tannic, structured wine that needs decades to soften. Winemakers manage maceration by controlling temperature, fermentation vessel, cap management technique (punching down, pumping over, or rack and return), and duration.

What is carbonic maceration and why does it taste different?

Carbonic maceration (CM) is a technique associated with Beaujolais, particularly Beaujolais Nouveau, though used widely in natural wine production. Whole, uncrushed grape bunches are placed in a sealed vessel under CO₂. In the absence of oxygen, fermentation begins inside the intact berry (intracellular fermentation) — a metabolic process that produces different aromatic compounds than conventional fermentation: amyl acetate (banana), ethyl cinnamate (bubble gum/cinnamon), and significant red fruit esters. After 5–15 days in this environment, the grapes are pressed and the wine is fermented conventionally to completion. The result: wine of bright ruby colour, low tannin (the skin tannin is not extracted normally), high glycerol, and vivid primary fruit. Fresh, light, highly approachable immediately — but rarely age-worthy. Semi-carbonic maceration (partial whole-cluster with some crushed grapes at the bottom) is common in Beaujolais Cru and produces more structured results.

How does maceration affect tannin quality?

Tannin quantity and quality are both shaped by maceration conditions. Seed tannins are harsher and more astringent than skin tannins; excessive pressing pressure or extended maceration at high temperatures risks extracting seed tannin. Temperature matters: extraction increases with temperature — cooler maceration (below 25°C) extracts more gently, producing finer-grained tannin; warmer fermentation (above 30°C) extracts faster and more aggressively. Duration determines how much tannin is extracted in total; but there is a crossover point where prolonged maceration in a dry wine (after fermentation is complete) begins extracting harsh, drying seed tannin as the fruit extraction is exhausted. The best winemakers taste constantly during maceration to judge the moment of peak extraction — the point of maximum fine-grained tannin before the harsher seed tannins dominate. See mouthfeel for how tannin translates to wine texture.

What is the difference between maceration and fermentation?

Maceration and fermentation are related but distinct processes. Fermentation is the conversion of sugar to alcohol and CO₂ by yeast — a biochemical process. Maceration is the physical extraction of colour, tannin and flavour compounds from grape skins — a process of diffusion and dissolution. In red wine production, both happen simultaneously: fermentation produces alcohol (which increases extraction efficiency) while maceration extracts colour and tannin. They are deliberately combined in the same vessel. Winemakers can also run them sequentially: cold soak (maceration before fermentation starts, at very low temperature that inhibits yeast activity) and extended maceration (maceration after fermentation is complete, with the wine dry). The distinction matters because each can be controlled independently — the winemaker can decide how much extraction they want independent of fermentation management.