II.4.1.8 Tirage

Classification :

• Active dry yeast : processing aid
• Ammonium chloride : processing aid
• Potassium alginate : processing aid
• Calcium alginate : processing aid

Definition:

Operation that consists of filling into bottles, that are hermetically closed, the cuvee, well mixed with tirage liqueur. An inoculum of selected yeasts is added, and possibly clarifying agents and activators of secondary alcoholic fermentation.

Objective :

To initiate secondary alcoholic fermentation with the aim of obtaining effervescence.

Prescriptions :

a)        The following clarifying agents are authorised :

• Bentonites (see Treatment with bentonites),
• Organic fining agents (see Fining),
• Tannins (see Tannin addition),
• Potassium alginate.

b)       Activators of secondary alcoholic fermentation are authorised (see Promoting secondary fermentation by the use of nutritive salts and of yeast growth factors)

c)        These products shall comply with the prescriptions of the International Oenological Codex .

Recommendation of OIV:

Admitted