In this letter Louis Pasteur indicates his displeasure with the winemakers of France for opposing pasteurization. He goes on to praise the California winemakers for embracing the process fully. In the letter, Pasteur writes, "until May 1, 1865, there did not exist, either in France or abroad, a single liter of wine preserved by my process." This seems to establish May 1, 1865 as the date in which pasteurization was first employed by the wine industry.
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Pasteur, Louis. “Letter from Louis Pasteur to an Unidentified Colleague, 1866,” September 5, 1866. Fisher-Pasteur Memorial Collection, Box 1, Folder 23. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/ws859f70x.
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