Liqueur de Tirage

What liqueur de tirage does

Liqueur de tirage drives the second fermentation in the bottle. It contains three components: still base wine, around twenty-four grams of sugar per litre, and a selected wine yeast. The producer adds the mix right before bottling. The bottle gets a crown cap and goes horizontal in the cellar.

Inside the bottle the yeast eats the added sugar. That fermentation produces around one and a half percent additional alcohol along with the CO₂ that forms the bubbles. Pressure inside the bottle climbs to roughly six bar, comparable to a truck tyre.

Why the recipe holds

The twenty-four grams per litre figure is not arbitrary. At that level the second fermentation yields exactly the target pressure without bursting the bottle. The Comité Champagne lists the ratio in its technical documentation as the regional standard. English sparkling producers like Nyetimber, Gusbourne and Wiston follow the same number for the same physical reason.

Yeast choice matters. Most producers reach for neutral commercial strains that do not overpower the base wine. A growing minority works with indigenous yeasts or aromatic selections. For blanc de blancs and long-ageing cuvées the cleaner strain usually makes sense, because the flavour signature only unfolds after years on lees.

Where the explanation tends to fail

Plenty of textbooks treat liqueur de tirage as a neutral process variable. That oversimplifies the picture. The choice of base wine for the liqueur, the yeast strain, even the fermentation temperature all shape the final wine. Two identical base wines run through different tirage protocols produce recognisably different Champagnes.

Anyone framing the second fermentation as a mechanical job of generating bubbles misses half the story. The yeast metabolites created at this stage build the aromatic scaffold on which years of lees ageing then sit.

What this means for the drinker

You will not find liqueur de tirage on a back label. No producer prints the yeast strain on the bottle. Indirectly it shows up. Vignerons working exclusively with indigenous yeast, several Aube growers among them, deliver a recognisably wild profile.

For most drinkers this level of detail matters only in direct comparisons. Two cuvées from the same producer side by side, one with indigenous yeast and one with cultured, show in half an hour how much this step actually moves the wine.