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The formula for Coca-Cola is one of the most jealously guarded trade secrets in the world. Coca-Cola contains a number of essential oils, and it is the precise way that these ingredients are blended together 21 is responsible for the drink’s unique flavor. However, 22 the creation of Coca-Cola in 1886, the precise recipe has been a closely guarded secret. The only official written copy of Coca-Cola formula is supposedly held in a U.S. bank vault, and only two company employees at any one time are said to know the whole formula. The exact ingredients of this popular soft drink, invented by a medicinal chemist called John Pemberton in 1886, have always been kept in 23 . It is said that Asa Candler, one of the first founders of the Coca-Cola Company, was worried that the recipe would fall into the wrong hands, so he made sure it was never written down. He removed all the labels from the containers of the ingredients so they were 24 only by the sight, smell and where they were put on the shelf. The Coca-Cola Company has always said that at any given time only two people know how to mix the flavoring ingredients, and the two people never travel on the same plane 25 it crashes. In 2010, Coca-Cola became the first brand to top £1billion in annual UK grocery sales, and it is no wonder that the firm has been eager to keep its recipe from competitors.