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Abbreviation for rectified grape must concentrate. Rectification is a thermal separation process for separating a homogeneous solution from two or more substances by repeated distillation or countercurrent distillation. This results in a concentration all soluble substances. A product is produced without the heat generated in other processes caramel flavor, It is made by partial dehydration using various methods. That is the difference too concentrated grape must, They are usually manufactured by vacuum evaporation of grape at very low temperatures to prevent the unwanted caramel taste (therefore fire heat is obsolete). Manufactured using the chemical process ion exchange is subject to strict EU prescriptive guidelines, A relatively new process is Spinning Cone Column, which is not approved within the EU. Wines treated in this way from 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 refractometer measured at 20 ° C sugar content not less than 61.7%. The concentrate is now only around a fifth of the original volume. In Austria and Germany RTK becomes the enrich (Alcohol increase) of quality wines is used, but this is not permitted for premium wines (in Austria from the cabinet). As a means of sweetening RTK is only for simple in Austria Wine (Table wine) and country wine ( PGI wine ) permitted, in Germany as so-called Süßreserve also for quality wine however not for Prädikatswein, In colder wine-growing regions, RTK is also used to blend simple, acidic wines to make them sweeter and milder. In England it is also common to make one out of it British Wine (also made wine) to produce designated wine (i.e. without grapes). The world's largest producer of RTK is South Africa, In Europe, large quantities are in Italy. France and Spain produced.

Complete lists of the numerous vinification measures or cellar techniques, as well as the wine, sparkling wine and distillate types regulated by wine law are under the keyword winemaking contain. There is extensive wine law information under the keyword wine law,

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