Posted on March 5, 2009March 30, 2019 by Judi Scherrer Winemaking 101: Sulfur Dioxide (SO2) Fred Scherrer briefly discusses the role of sulfur dioxide or SO2 in winemaking. Filmed at Flickinger Wines in Chicago. Post navigationPrevious post: Cabernet Sauvignon from the Scherrer VineyardNext post: Can I age Zinfandel wine?