A seller of wine selling a cellar of wine - where the difference between a barrel vs. the stock carries real implications for the shift from wine to vinegar being an issue for the sale. Also, when wine is sold in a store, the blessing over it should be the one for wine (Borei Pri HaGefen). But there is a risk of the wine becoming vinegar - and when it's turning, or turned, it should get the more generic "Shehakol" blessing.