Containers made of this material are used as an alternative to oak wood, stainless steel or natural stone (granite) for fermenting and storing wines. Conventional concrete tanks are usually lined on the inside with glass tiles or stainless steel sheets, less frequently with plastic or coated with varnish. The advantages are optimum space utilisation, flexible volumes and low shrinkage. Since the mid-1990s, experiments have been carried out with egg-shaped concrete containers, first in France and then in Spain and now also in Germany. In the German wine-growing region of Franconia, some winegrowers are using such "concrete eggs" with a volume of 900 litres.
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