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Samples of bacteria colonies in milk. Sample on right was made before pasteurization and that on the left after pasteurization. Samples were used in bacteriology class of the Dairy Industry Department to show that not all bacterial colonies are destroyed in pasteurization. Iowa State Collge, Ames, I
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Samples of bacteria colonies in milk. Sample on right was made before pasteurization and that on the left after pasteurization. Samples were used in bacteriology class of the Dairy Industry Department to show that not all bacterial colonies are destroyed in pasteurization. Iowa State Collge, Ames, I

Delano, Jack · 1942-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

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iowasafety film negativesstory countyamesunited states
Credit lineSamples of bacteria colonies in milk. Sample on right was made before pasteurization and that on the left after pasteurization. Samples were used in bacteriology class of the Dairy Industry Department. 1942-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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