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Abbreviation for rectified grape must concentrate. Rectifying means "clean" or separating a liquid mixture into its components by repeated distillation . This results in a Concentration all soluble substances so that the treated mixture. According to EU regulation or definition, this is now a non- Caramel Grape must which is obtained by partial removal of water using any method (except for exposure to fire, heat). The are usually prepared by vacuum evaporation of must at very low temperatures to prevent unwanted caramel flavor. The production by the chemical process Ion exchange subject to strict EU prescribing guidelines. A relatively new procedure is Spinning Cone Column (Spinning cone column).
The general requirements include: pH value more than 5, sulfur dioxide up to 25 mg / kg, a maximum of 1% alcohol by volume and by refractometer at 20 Â° C of measured value (sugar) is not less than 61,7%. The concentrate has only about one-fifth the original volume. In Austria and Germany is the RTK Enrich (Alcohol-raising) is used, which is not for quality wines (from Austria in Cabinet Affairs). As a means of Sweetening It is permitted only in Austria for table or wine country, in Germany as a so-called Fining for quality wines (psr) but not for quality wines (QmP). In colder areas, wine RTK is also used for blending of simple acid-stressed wines in order to make sweet and mild. In England it is also common for them as a British Wine Manufacture (including Wine Made) designated wine (without grapes). The world's largest producer of RTK is South Africa . See also Concentrated grape must .