 Similar to the Bordeaux mixture, one of the earliest fungicides in use, Burgundy mixture, also known as “sal soda Bordeaux”, is used as a fungus preventative applicant on plants before fungi have appeared.Bordeaux mixture contains copper(II) sulfate, CuSO4, and hydrated lime, Ca(OH)2, while Burgundy mixture contains copper sulphate, CuSO4, and sodium carbonate, Na2CO3.First used around 1885, Burgundy mixture has since been replaced by synthetic organic compounds, or by compounds that contain copper in a non-reactive, chelated form.