II.3.2.6 Tannin addition

Definition:

Addition of tannins to wine.

Objectives:

a)        To facilitate the stabilisation of wines by partial precipitation of excess proteinaceous matter;

II.3.2.5 Decanting

Definition :

Operation consisting of transferring from one wine tank to another:

A still wine at normal pressure,

Objectives :

a)        To separate wines from their lees, deposited on the bottom of the container.

II.3.2.4 Treatment with silicon dioxide

Classification:

• Colloidal silicon dioxide solution: processing aid

Definition :

Addition to wine of a colloidal solution (gel) of silicon dioxide coupled with the addition of a gelatin solution or, possibly, with other proteinaceous finings.

Objective :

II.3.2.3 Racking

Classification:

• Nitrogen: processing aid
• Argon: processing aid

Definition :

Operation involving the transfer of wine from one wine container to another by allowing the separation of solid deposits from the liquid.

Objectives:

II.3.2.2.2 Sterilising filtration

Definition:

Filtration of wines on materials allowing the elimination of microorganisms.

Objective :

To obtain biologically stable wines for bottling.

Prescriptions :

II.3.2.2.1 Filtration by continuous deposition

Definition :

Filtration of the wine, after formation of a filter bed, which is then fed constantly by a continuous addition of filter material into the wine to be clarified.

Objective :

To obtain a suitable level of clarity, to a given technological stage, by the elimination of substances in suspension in the wine.

II.3.2.2 Filtration

Classification:

• Diatomite: processing aid
• Perlite: processing aid

Definition:

Physical process consisting of passing the wine through appropriate filters that retain particles in suspension.

Objectives:

II.3.2 Clarification of wine

II.3.1.2.4 De-acidification using an electromembrane process

Definition:

Physical method of ionic extraction from the wine under the action of an electric field using permeable membranes with anions on the one part and bipolar membranes on the other. The combination of permeable membranes with anions and biopolar membranes is used to manage a reduction in titratable acidity and the actual acidity (increase in the pH)