SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Margarine production. Early 20th-century artwork of workers stirring margarine during production. Margarine is a butter-substitute that does not contain dairy fat, but is usually made from vegetable oils and skimmed milk. It was first produced commercially from the 1870s, with a variety of methods and ingredients. Artwork from the 25th volume (first period of 1900) of the French popular science weekly 'La Science Illustree'.
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