A distinction must be made between a deliberately induced second fermentation in the bottle in the production of quality sparkling wine and an undesirable secondary fermentation in a still wine:
By the so-called Dosage (Fülldosage = sugar and yeast) consciously in a fermented already fermented fermented second fermentation in the bottle in the production of sparkling wine. A bottle fermentation is at one champagne Mandatory under state law, with other sparkling wines, the second fermentation but also in the tank by means Méthode charmat be done. Flaschenvergorene sparkling wines are on the label declared by EU-standardized designations. these are Méthode champenoise (only for champagne), or Méthode classique (also Méthode traditionnelle), which is also allowed in the national language. In the absence of the label is to assume that the sparkling wine was not produced by the classical method.
An unwanted fermentation or secondary fermentation in still wine can be considered alcoholic fermentation or malolactic fermentation (BSA) occur. Prerequisite is enough residual sugar and presence of bacteria or yeasts which can multiply there due to warm ambient temperature. For high content of alcohol or sulfur the process is inhibited. Causes are mostly lacking hygiene and / or a problem with the filtration, In the case of alcoholic fermentation, the taste of the grape is often more noticeable; in the case of malolactic fermentation, lactic notes of milk or cheese. Visible, this expresses itself through opacities or veil. The relatively high content carbon dioxide In extreme cases, it can also lead to the bottle exploding. When opening the bottle, this is noticeable by a distinct noise (a "pop"). Post fermentation is definitely a dreaded, unacceptable one wine faults,
A detailed description of sparkling wine production with all processing steps is available at champagne, Complete listings of the numerous vinification measures and cellar techniques, as well as the wine-regulated wine, sparkling wine and distillate types are under the keyword winemaking contain. Comprehensive information on wine law is available under the keyword wine law,