Austrian wines are mostly dry white wines (often made from the Grüner Veltliner grape), though some sweeter white wines (such as dessert wines made around the Neusiedler See) are also produced. About 30% of the wines are red, made from Blaufränkisch (also known as Lemberger, or as Kékfrankos in neighbouring Hungary), Pinot noir and locally bred varieties such as Zweigelt. Four thousand years of winemaking history counted for little after the "antifreeze scandal" of 1985, when it was revealed that some wine brokers had been adulterating their wines with diethylene glycol. The scandal destroyed the market for Austrian wine and compelled Austria to tackle low standards of bulk wine production, and reposition itself as a producer of quality wines. The country is also home to Riedel, makers of some of the most expensive wine glasses in the world. Some of the best producers of Austria include Weingut F.X. Pichler and Weingut Franz Hirtzberger, Weingut Hutter, Weingut Eigl and Wellanschitz.