This special type of wine from Slovenia is classified as an origin-protected PTP. The name is derived from the Slovenian name for the sour thorn due to its sour taste. The bright red wine is a blend of white and red wines. This is not permitted under EU wine law, so an exemption was successfully applied for. Although it is a rosé-like wine, it may not be called rosé. The production rules include 23 articles, among them the grape varieties. The red wine is made from Žametovka = Blue Cologne (40-50%, with special permission up to 60%) and Modra Frankinja = Blaufränkisch (15-20%, with special permission up to 30%). The white wine is produced from Kraljevina = Red Portugieser (10-15%), Laski Rizling = Welschriesling (up to 15%), and the rest alternatively from Rumeni Plavec = Plavec Žuti, Zeleni Silvanec = Silvaner, Bela Žlahtnina = Chasselas and Stajerska Belina = Ranfol. The dry, acidic wine may have a maximum of 2.5 g/l residual sugar. A mixture of grapes is also used for Badisch Rotgold, Rotling, Schieler, Schiller and Schillerwein. See also under Rosé.