Why "Coke" must have "caffeine"
"Caffeine" is derived from the use of plants called "Coca" as an ingredient in the production. By this "Coca" has caffeine and the power to stimulate the soft neurons. In the early stages, it had even "cocaine" mixed with cocaine because it is a substance extracted from the same Coca. But after discovering the disadvantage of "cocaine" early in the twentieth century, the Cola Company began to cut the cocaine out of the ingredients.
Why "Coke" must have "black colour"
The black color of Coke is because from recipes to cook. Even when the beverage became popular and the recipe was changed, it was still black, as there was never a change, Because the manufacturer is considered to be unique to the cola.
But at one time a company the "Coca-Cola" in the United States has a plan to do "colorless coke" up. By the drink is a clear color like the "Vodka" Russian favorite beer. Because "Coca-Cola" is preparing to bring this colorless Coke to distribution in the Soviet Union. But later, there were serious political problems between "America" and "Soviet", resulting in boycott of all American and Western goods in communist countries. So this colorless coke project must be folded down unfortunately.