“Sulfur dioxide is one of the older amendments added to wine.” This was an opening statement by Dr. Andrew Waterhouse, professor of enology in the department of viticulture and enology at the University of California, Davis, in his address to the Unified Wine & Grape Symposium in 2020 for the best paper in enology. While listening to his talk, I knew that an article could provide readers with important new information about SO2 discovered by Waterhouse and his lab, as w...