Ascorbic acid (vitamine C) is a popular antioxidant, it stabilizes the colour and the clarity of the wine and improves the aroma of the wine.
Usage:
Add ascorbic acid into clarified wine just before bottling in amount of 10 g/100 l (distribute proporcionally to the volume of the wine).
It allows to reduce the potassium pyrosulfite dosis to 50-66%.