Arany Kapu Ltd. is a large-scale industrial works utilizing wine- and wine-growing by-product. By means of complete utilization of these by-products, this is the largest wine-brandy producing company in Hungary as well as the only maker of tartaric acid in Central-Europe. In addition to purchasing the dregs of wine, wine-paste and tartar, the company collects grape marc – used for power generation, from the whole country, and also contracts to separate fresh and fermented grape seeds at the customer’s request.