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Abbreviation for rectified concentrated grape must. Rectification means the "cleaning" or separation of a liquid mixture into its components by repeated distillation, This results in a concentration all soluble substances. The result is a product without the other processes resulting from heating caramel flavor, It is made by partial dehydration using any method (except for heat induced by fire). That's the difference too concentrated grape must, The preparation is usually by vacuum evaporation of grape at very low temperatures to prevent the unwanted caramel taste (therefore fire heat is obsolete). The production by means of the chemical process ion exchange is subject to strict EU prescriptive guidelines, A relatively new process is Spinning Cone Column (Centrifugal column), but this is not permitted within the EU. However, wines treated in the USA may be marketed in the EU.

The guidelines include: PH value maximum 5, sulfur dioxide maximum 25 mg / kg, alcohol content maximum 1% vol and by means of refractometer measured at 20 ° C sugar content not below 61.7%. The concentrate only has about one-fifth of the original volume. In Austria and Germany RTK becomes the enrich (Alcohol increase) used by quality wines, but this is not for premium wines (in Austria from Cabinet) is allowed. As a means to sweetening RTK in Austria is only for simple Wine (Table wine) and country wine ( Wine PGI ), in Germany as so called Süßreserve also for quality wine but not for Prädikatswein, In colder vineyards, RTK is also used to blend simple, acidified wines to sweeten and soften them. In England, it is also common, as a British Wine (also Made Wine) designated wine to produce (ie without grapes). The world's largest producer of RTK is South Africa, In Europe, large quantities are in Italy. France and Spain produced.

Complete listings of the numerous vinification measures and cellar techniques, as well as the wine-regulated wine, sparkling wine and distillate types are under the keyword winemaking contain. Comprehensive information on wine law is available under the keyword wine law,

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