How sparkling wine is made - traditional method versus Charmat
The bubbles in wine look like magic, but they are the result of a specific process: a second fermentation. The trick is that there are two completely different ways of carrying it out, and the choice between them decides the flavour, price and character of the wine. That is why Champagne tastes different from Prosecco, though both are sparkling. Understanding the difference between the traditional method and the Charmat method lets you know what to expect before you open the bottle, and stop overpaying or underrating.
Where the bubbles come from
First the foundation. Sparkling wine starts like an ordinary still wine, that is, non-fizzy. Then it undergoes a second fermentation in a sealed vessel, with a little sugar and yeast added. The yeast eats the sugar and produces alcohol and carbon dioxide, which this time has no way to escape, so it dissolves into the wine under pressure. When you open the bottle, the gas is released as bubbles. I describe the whole basic fermentation process in how wine is made. The difference between the methods comes down to one question: where this second fermentation happens, in the bottle or in a large tank.
The traditional method - second fermentation in the bottle
The traditional method, also called the classic or Champagne method, is the most labour-intensive and prestigious route. The second fermentation happens in the very bottle the wine will later be sold in. After it, the wine ages for a long time in contact with the sediment of dead yeast, called the lees, usually at least nine months and often several years. This contact is crucial, because it gives the wine its characteristic notes of bread, brioche, nuts and creaminess. The whole process from start to finish takes at least around fifteen months, and in the best wines years.
The result is wines with very fine, persistent bubbles, complex, creamy, with a toasty, yeasty character. This method makes Champagne from France, Spanish Cava, French Crémant and Italian Franciacorta. The high price comes precisely from the time, the hand work and the years of ageing.
The Charmat method - second fermentation in a tank
The Charmat method, also called the tank or Martinotti method, takes a completely different route. The second fermentation happens not in the bottle but in a large, pressurised steel tank, and the finished, already carbonated wine is bottled under pressure. The whole process is quick, usually one to six weeks, and much cheaper. The wine spends little or no time on the lees, so it does not pick up toasty notes.
The result is wines that are fresh, fruity and floral, with larger, more pronounced bubbles, emphasising the primary fruit aroma rather than yeasty complexity. This method mainly makes Prosecco. These are not lesser wines but different ones: made to deliver freshness and fruit, not the depth of ageing.
How to taste it in the glass
From this comes a simple flavour map:
- The traditional method - fine bubbles, notes of bread, brioche, nuts, a creamy texture, greater complexity. Champagne, Cava, Crémant.
- The Charmat method - larger bubbles, fresh fruit, flowers, lightness, no yeasty notes. Prosecco.
There is also a third, older route, called the ancestral method or pét-nat, where the wine is bottled before the first fermentation finishes, and the bubbles form naturally. This gives rustic wines, often cloudy and unpredictable, fashionable today among lovers of natural wine.
Bubbles, acidity and serving
Whatever the method, a good sparkling wine needs high acidity, which gives freshness and balances any sweetness added at the end. I cover the role of acidity in acidity in wine. Sparkling wines are served well chilled, and a slender glass helps keep the bubbles longer.
How to explore them
The best way to feel the difference is to compare a Champagne or Cava from the traditional method and a Prosecco from the Charmat method side by side. The contrast between toasty, creamy complexity and fresh, fruity bubbles is immediate. In GustoNote you note the method, bubble size, aromas and your impressions of every sparkling wine, and after a few entries you will see whether you lean toward yeasty depth or fruity freshness. It turns a general I like bubbles into a specific, conscious choice at the shelf. You will find a full overview of wine types in types of wine.