(A very particular exception to the destemming rule for reds is a fermentation technique called carbonic maceration,characteristic of Beaujolais,some Côtes du Rhône, and naturally tough Carignan in the Languedoc-Roussillon, where the aim is to produce fruity wines without much tannin. Here whole bunches are put into a sealed fermentation vat, the bottom layer of grapes is crushed by the weight of grapes above and starts fermenting naturally, giving off carbon dioxide The whole vat becomes saturated in carbon dioxide under whose influence the whole grapes in the upper part of the vat undergo a special sort of internal fermentation whose products have a characteristic soft,almost rubbery smell.)