The stage going from the pressing to the start of the alcoholic fermentation is a delicate moment, where there is the presence of noticeable quantities of dissolved oxygen in the must.

The addition of Fermotan Blanc stops the progressive darkening of oxygen-rich white musts, without increasing their color.

It strengthens resistance to oxidation and preserves aromatic freshness. Acts in synergy with sulphur dioxide, thus retaining a higher percentage of free sulphur dioxide at the end of fermentation.