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Container made â€‹â€‹from this material are as an alternative to wood or steel for the fermentation and storage used for wine. The conventional concrete tanks are mostly inside with glass tiles or stainless steel plates, lined with plastic, or less often coated with varnish. The advantages include optimum use of space, flexible Voluminas and low loss . Since the mid-1990s, beginning in France and then Spain and now in Germany experimented with egg-shaped concrete tanks. In the German region Franconia are some winemakers such "concrete egg" in a volume of 900 liters used. These concrete tanks are not lined. As with wooden barrels made by a contact with oxygen, compared to wood, however, a perhaps undesirable wood flavors avoided. The wines have developed is supposed to more intense flavors. See also wine vessels .