This complex acid material is the “flavour.” The flavour enters the wash after fermentation has begun owing to the presence of acids in it which are injurious to yeast, the fermentation is prolonged and the sugar is never very completely fermented out. Fermentation lasts 9 to 10 days and the dead wash lies for several days longer.
I don't understand, when exactly the "flavour" is added to the wash. For me it sounds, they start the ferment without the flavour. Then the wash turns acidic. But by itself or also by the now added flavour?
"Prolonged" means the fermentation lasts longer. But because of the sugars in the now added flavour or because the acid of the flavour slows it down, or both?
"The sugar is never very completely fermented out" Because of the acid?
Please members, help me from

