once the yeast is added alcoholic fermentation begins in red wine production , the must is typically fermented for a shorter time. but at a higher temperature then white wine Where as white wines may be fermented for a month or more , it is rare for it to take longer than two weeks for red wines
white wine fermentation carried out between 12-15 c . as fermentation proceeds a lot of heat is produced and this is controlled by the cooling jackets on the fermenter
red wine fermentation carried out between 20-29 c . This helps in removal of skins quite early and easily during fermentation. Fermentation can be carried out in closed or open fermenter. During fermentation the skins tend to float. these skins are pushed again back into the medium by mechanical means