In the processing of grapes for wine materials, secondary raw materials are formed, the main representatives of which are the ridges, husks, seeds, peels, yeast sediments, incl. and containing blue azure, bards, whose share is 15 ... 20%.
The main products of grape marc refining are: raw alcohol, tartaric lime, tartaric acid, and food eno dye. From the grape marc is obtained: tartaric acid, food eno dye, seeds, feed, pectin, soft drinks, fertilizers.
The most cost-effective products of processing are bioethanol, food enocolator, grape seed oil, tartaric acid and its derivatives, methane gas from brandy bards, activated carbon from grape vines and bentonite sludge, nitrogenous fertilizers, enomelanin from marc, etc.