Which ultratrace element was used as a preservative for meat, fish, and dairy products in the early 1900s, considered dangerous for humans in the 1920s, and then deemed essential starting in the 1980s?

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The Answer of Which ultratrace element was used as a preservative for meat, fish, and dairy products in the early 1900s, considered dangerous for humans in the 1920s, and then deemed essential starting in the 1980s?

Which Ultratrace Element Was Used as a Preservative for Meat