Which celebrated chemical fungicide mixture was discovered by Professor P.M.A. Millardet in Bordeaux, France in 1885 to control downy mildew of grapevine?

Millardet discovered Bordeaux Mixture in 1885 by mixing Copper Sulphate (CuSO4) and Slaked Lime [Ca(OH)2] in water (typically 5:5:50 ratio), which remained the benchmark contact protective fungicide for a century.