Steps InvolvedAs opposed to other wine types, the main distinction in Red Wine Production is that the skins are allowed to macerate in the must for some period of time. This is what gives red wine its colour, tannins, and allows the best to age for many years.Destemming & Crushing Red GrapesImmediately after arriving at the winery, the process of destemming and crushing red grapes begins. The resulting liquid is called the must and consists of skins, seeds and juice. It is important that as many stems as possible are removed, as they contain abrasive, unpleasant tannins. This is the first step in the Red Wine Production process.