"Ascorbic Acid" is a strong anti-oxidant and can be used instead of bisulphite at racking time to prevent over-oxidation.
1 Kg (2.2 lb.)

Ascorbic Acid is a strong anti-oxidant and can be used instead of bisulphite at racking time to prevent over-oxidation. If it is used, it must be remembered that it will raise the acidity of the wine. Some commercial vignerons use it in the production of wines which are high in malic acid. It is not bacteriocidal, so that after racking, a malo-lactic fermentation can be encouraged to change the malic acid to lactic and thereby smooth the wine.
DIRECTIONS: Add 1/2 tsp (2.5g)/gallon to finish wine prior to bottling. Preserves colour, flavour and minimizes oxidation during long term storage. May be used as a sulphite alternative for wines.