The wines remain in the casks for several weeks. During this period, clarification occurs naturally from the cool temperature of the cellar given the coming winter, as does a micro-oxygenation process from the use of natural containers, making the wine more resistant to oxygen over time. Finally, between December and January, the wine is drawn off into small stainless-steel vats. From here, depending on the decisions of Krug's tasting committee, the wines will either contribute to that year's "assemblage" or be stored in steel vats in the House's library of 150 reserve wines to be used in the blend of a future Krug Grande Cuvée and Krug Rosé.