Definitions for "Fermenting"
Black tea is fermented (oxidised) due to the action of its own enzymes. Fermenting causes green polyphenols (catechins) to change to orange red theaflavins and thearubigins; fermenting takes 60 - 180 minutes.
A process where yeasts eat the sugars in a substance.
a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol