Effervescence is the distinctive mark of Champagne wines, a touch of magic that makes them unique. It is also the first indication of their quality. A sustained, durable yet delicate mousse creates a fine impression of the wine. An imperfect mousse suggests a disappointment in store and may lead to a hasty judgement of the wine.

Little is known however about this fragile, complex phenomenon that plays such a vital role in Champagne wines. This chapter is created to help lovers of Champagne understand a process that the Champenois have perfected over centuries and made entirely their own. It contains a wealth of details ranging from the history and science of effervescence to modern technology and the secret behind its unique sensory characteristics.