← Wine guide

Vin jaune and the veil of yeast (voile) from the Jura - yellow wine under the veil

In the French region of the Jura, between Burgundy and Switzerland, one of the most unique wines in the world is made: vin jaune, that is yellow wine. Its secret is something that in most wines would be a disaster - a veil of yeast on the surface and deliberately not topping up the barrel, so the wine oxidises slowly over years. For over six years vin jaune matures under a veil (voile), a film of living yeast, which protects it from full oxidation, giving it an intense, nutty, almost sherry flavour. The result is a wine of remarkable depth, longevity and strength, bottled in an odd, squat bottle. Here is a guide to vin jaune: what the veil of yeast is, how this wine is made, where its flavour comes from and why the bottle is so unusual.

What vin jaune is

Vin jaune is a special style of wine from the French Jura region, made solely from one grape: savagnin. Its name, yellow wine, comes from the characteristic, deep, golden-yellow colour the wine takes on during its long maturation. It is a wine of official classification and strict rules, belonging to the broader family of sous voile (under the veil) wines. The most famous vin jaune is the one from the Chateau-Chalon appellation, considered its highest expression. Vin jaune is famous for its intense, nutty, oxidative character, close to Spanish fino sherry, and for its exceptional longevity - it can mature for decades, even centuries. It is one of the most original wines of France. Understanding that vin jaune is a yellow, nutty wine from savagnin, maturing under yeast, is the starting point for the rest. It is a curiosity in the world of wine. We cover oxidative wines more in port, sherry and madeira.

The veil of yeast (voile)

The heart of vin jaune is the veil, in French voile - a film of living yeast growing on the surface of the wine. It is exactly the same mechanism as with Spanish fino or manzanilla sherry, where it is called flor. It works like this: after fermentation the wine is kept in small, old oak barrels of a capacity of 228 litres. The barrel is deliberately not topped up with wine, so as evaporation occurs an air gap forms above the wine. On the surface of the wine, in contact with oxygen, a veil of yeast grows. This living yeast protects the wine partly (but not completely) from oxidation, and at the same time transforms it, giving the characteristic flavour. This is the key difference from ordinary oxidation: the veil is biological maturation, not just contact with air. Understanding that the voile is a living layer of yeast protecting and transforming the wine is the key to the whole style. It is microbiology in the service of flavour.

How vin jaune is made

The making of vin jaune is a lesson in patience and controlled risk. After a slow fermentation the savagnin goes into old barrels, which are deliberately not topped up - the opposite of normal practice, where the winemaker tops up the losses to protect the wine from oxidation. Here the point is the opposite: to leave an air gap, so a veil of yeast can grow. Under this veil the wine matures biologically, slowly oxidising and transforming. The law requires it to spend over six years under the veil - precisely a minimum of 60 months in the barrel, and from harvest to bottling at least six years and three months must pass. It is an enormously long maturation, during which the wine loses volume and gains intensity. It is a process that demands nerves: the veil must hold, and the wine must not spoil. Understanding this long, risky road explains the character and price of vin jaune. It is a wine for the patient.

Where this nutty flavour comes from

The characteristic flavour of vin jaune - intense, nutty, spicy - is born directly from the maturation under the veil. The long biological oxidation produces particular flavour compounds. The dominant one is sotolon, which gives notes of curry, fenugreek and walnut - it is responsible for the characteristic, spicy-nutty aroma of vin jaune. To this is added acetaldehyde, forming during oxidation, giving notes of bruised apple and nuts. Together they create an unrepeatable profile: nutty, spicy, with notes of dried fruit, almonds, and sometimes even of maturing comte cheese. It is an intense, dry and very long flavour on the palate, far from the fruity freshness of ordinary white wines. Vin jaune is close to fino sherry, but has its own, Jura character. Understanding that the veil creates these particular compounds explains the unrepeatable flavour. It is the chemistry of maturation turned into aroma. We cover the faults of oxidation more in wine faults.

A table: vin jaune in brief

Let us gather the features of vin jaune in one place:

The table shows the heart of it: vin jaune is a yellow wine from savagnin, maturing over six years under a veil of yeast, of a nutty flavour and in an unusual bottle. It is a unique combination of rules and character.

The odd clavelin bottle

Vin jaune has one more unique feature: an unusual bottle. It is always bottled in a characteristic, squat bottle called a clavelin, of a remarkable capacity of 62 centilitres (0.62 litres), instead of the standard 75. Where does this odd measure come from? It is a remnant of the maturation: from each litre of wine put into the barrel, after over six years under the veil, on average about 62 centilitres remain - the rest evaporated, given to the veil and the air. The clavelin bottle therefore symbolises what is left of a litre after the long maturation. It is a rare example of a bottle of a non-standard, historically justified capacity. For the drinker the clavelin is an instant hallmark of vin jaune - seeing this squat bottle, you know what you are dealing with. Understanding this curiosity completes the picture of the wine. It is a bottle that tells the story of maturation. Every clavelin is a memento of the evaporated veil.

Vin jaune versus sherry

It is worth comparing vin jaune with Spanish sherry, because both are wines maturing under a veil of yeast, but there are differences. The similarity is real: both vin jaune and fino and manzanilla sherry mature biologically under a film of yeast (the veil, flor), which gives them a shared, nutty, oxidative character. But there are differences too. Sherry is a fortified wine - alcohol is added to it to raise the strength. Vin jaune is not fortified - it is a wine of natural strength, without added spirit. Sherry comes from Spain and is made from palomino, vin jaune from the French Jura and solely from savagnin, in a different climate and tradition. Sherry also matures in the solera system (mixing vintages), vin jaune as a single vintage. They are two related but distinct styles. Understanding these differences helps appreciate the Jura original. We cover climate and style more in Old World and New World.

Why it is worth knowing

Vin jaune is worth getting to know, because it is one of the most original and fascinating wines in the world. First, it has an unrepeatable flavour - intense, nutty, spicy, which you will not find in any other French white wine. Second, it has remarkable longevity: well-stored vin jaune can mature for decades, even centuries, which makes it a collectible wine. Third, it is outstanding at the table - its nutty-spicy character pairs beautifully with the local comte cheese, chicken in a sauce or mushroom dishes. Fourth, it is a living lesson in how something that is usually a fault (oxidation) can become a virtue under deliberate management. For an enthusiast vin jaune is a fascinating discovery and an entry into the world of sous voile wines. It is worth trying a glass, best with comte, to feel this depth. It is a wine with character and history. It is a treasure of the Jura worth knowing.

How to sense it in the glass

Vin jaune is easy to recognise by its characteristic, intense profile. You sense above all deep notes of walnut, almond, spice (curry, fenugreek), dried fruit and bruised apple, with a lightly oxidative, sherry-like character. The wine is dry, intense and exceptionally long on the palate - the flavour holds for minutes. The colour is deeply golden-yellow, hence the name. Unlike fresh, fruity white wines, vin jaune is serious, mature and complex. If a white wine has an intense nutty-spicy flavour, is in a squat clavelin bottle and comes from the Jura, it is without doubt vin jaune. Serve it at room temperature or lightly chilled, best with comte cheese or mushroom dishes. It is worth comparing it with fino sherry, to feel the kinship and differences. Over time you will come to appreciate this unique, nutty depth. It is a flavour that stays in the memory.

The essentials in brief

Let us gather it up. Vin jaune (yellow wine) is a unique wine from the French Jura region, made solely from savagnin. Its secret is the veil (voile) - a film of living yeast that forms on the surface of the wine in a deliberately untopped barrel, protecting it partly from oxidation and giving flavour (like the flor in fino sherry). The wine matures under the veil for over six years (a minimum of 60 months in the barrel). This long biological oxidation produces compounds like sotolon (curry, fenugreek, walnut) and acetaldehyde, giving a nutty, spicy, sherry-like flavour. It is bottled in a squat clavelin bottle of 62 cl - that is what remains of a litre after maturation. Unlike sherry, vin jaune is not fortified. It is a long-lived, original wine, outstanding at the table. Now you know where this magic from under the veil comes from.

Note every wine in GustoNote - including whether it is vin jaune and the nutty notes you sense. Over time you will start to recognise the characteristic flavour of wines maturing under a veil.