The red variety is a new breed between Blue Portuguese
x teinturier (the parent is not unique). Synonyms are Whip Vine, Sloe berry and Black Kadarka. The crossing took place around the year 1940 by the Austrian breeder Hans Schlager in the Styrian viticulture institute Silberberg
after which she was named. It produces dark red wines with fruity forest berry flavor. Due to the low yield, the variety has ultimately not prevailed. But it is as a local specialty in the Styria
) approved for quality wines.