<P> During the late 19th century, Coca - Cola was one of many popular coca - based drinks with purported medicinal properties and benefits to health; early marketing materials claimed that Coca - Cola alleviated headaches and acted as a "brain and nerve tonic". Coca leaves were used in Coca - Cola's preparation; the small amount of cocaine they contained--along with caffeine--provided the drink's "tonic" quality . In 1903, cocaine was removed, leaving caffeine as the sole stimulant ingredient, and all medicinal claims were dropped . According to some sources, coca leaf extract, with the cocaine chemically removed, remained part of the formula . By one account, the FDA still screens random samples of Coca - Cola syrup for the presence of cocaine . The company will neither confirm nor deny that the current version of Coca - Cola contains coca leaf extract, deferring to the secret nature of the formula . </P> <P> In 1911, the United States Government sued the Coca - Cola Company for violations of the Pure Food and Drugs Act, claiming that the high concentration of caffeine in Coca - Cola syrup was harmful to health . The case was decided in favor of Coca - Cola, but a portion of the decision was set aside in 1916 by the Supreme Court . As part of a settlement, the company agreed to reduce the amount of caffeine in its syrup . </P> <P> The company protects the secrecy of its syrup recipe by shipping ingredients to its syrup factories in the form of anonymous "merchandises", numbered 1 through 9 . Factory managers are told the relative proportions of each numbered merchandise, and the mixing procedure, but not the ingredients in the merchandises, some of which are themselves mixtures of more basic ingredients . Merchandise no . 1 is known to be sugar, in the form of high - fructose corn syrup or sucrose (see variations, below); caramel coloring is no . 2, caffeine is no . 3, and phosphoric acid is no . 4 . The identities of merchandises 5 through 9 are a matter of considerable debate--particularly the legendary "merchandise 7X" (the "X" has never been explained), which is thought to contain a mixture of essential oils such as orange, lime, and lemon . Another ingredient is thought to be lavender . </P> <P> Despite the implications of its name, there is no evidence that the current version of Coca - Cola syrup contains either coca leaf or kola nut extract; both substances have unpleasant, bitter flavors completely unlike that of Coca - Cola . (Nevertheless, a New Jersey company was named by one source as a supplier of coca extract to Coca - Cola .) The primary taste of Coca - Cola is thought to come from vanilla and cinnamon, with trace amounts of essential oils, and spices such as nutmeg . A 2015 study identified and measured 58 aroma compounds in common colas, confirming significant amounts of compounds corresponding to cinnamon, vanilla, nutmeg, orange and lemon essential oils in Coca Cola . </P>

What is the natural colour of coca cola
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