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The gelatin in film stock was made from the hide, bones, cartilage, ligaments, and connective tissue of calves (considered the very best), sheep (less desirable), and other animals who passed through the slaughterhouse. Six kilograms of bone went into a single kilogram of gelatin. Eventually, the demands of photographic industries generated so much need for animal byproducts that slaughterhouses became integrated into the photographic production chain. Controlling the supply chain became key to Kodak's success. In 1882, as Kodak began to grow as a company, widespread complaints of fogged and darkened plates stopped production. The crisis almost ruined Kodak financially and resulted in the company tightly monitoring the animal by-products used in gelatin. Decades later, a Kodak emulsion scientist discovered that cattle who consumed mustard seed metabolized a sulfuric substance, enhancing the light sensitivity of silver halides and enabling better film speeds. The poor-quality gelatin in 1882 was due to the lack of mustard seeds in the cows' diet. The head of research at Kodak, Dr. C. E. Kenneth Mees, concluded, "If cows didn't like mustard there wouldn't be any movies at all." By controlling the diet of cows who were used to make gelatin, Kodak ensured the quality of its film stock. As literary scholar Nicole Shukin reflects, there is a "transfer of life from animal body to technological media." The image comes alive through animal death, carried along by the work of ranchers, meatpackers, and Kodak production workers.