In the 19th century, it was common to adulterate foodstuffs by adding cheap substances. Calcium sulphate was added to peppermints. In 1858 a sweet maker in Bradford, England sent somebody to obtain some from a druggist. However, by mistake, the druggist's assistant picked up some arsenic thinking it was calcium sulphate. The arsenic was added to the sweets. As a result, 200 people became seriously ill and 20 died.
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