The Coca-Cola Company’s formula for Coca-Cola syrup, which bottlers combine with carbonated water to create the company’s flagship cola soft drink, is a closely guarded trade secret.
Company founder Asa Candler initiated the veil of secrecy that surrounds the formula in 1891 as publicity, marketing, and intellectual property protection strategy.
While several recipes, each purporting to be the authentic formula, have been published, the company maintains that the actual formula remains a secret, known only to a very few select (and anonymous) employees.
Coca-Cola inventor John Pemberton is said to have written this recipe in his diary shortly before his death in 1888.
The recipe does not specify when or how the ingredients are mixed, nor the flavoring oil quantity units of measure (though it implies that the “Merchandise 7X” was mixed first).
This was common in recipes at the time, as it was assumed that preparers knew the method.
Ingredients:
1 oz (28 g) caffeine citrate
3 oz (85 g) citric acid
1 US fl oz (30 ml) vanilla extract
1 US qt (946 ml) lime juice
2.5 oz (71 g) “flavoring” (i.e., “Merchandise 7X”)
30 lb (14 kg) sugar
4 US fl oz (118.3 ml) fluid extract of coca leaves (flavor essence of the coca leaf)
2.5 US gal (9.5 l; 2.1 imp gal) water
caramel sufficient to give color
“Mix caffeine acid and lime juice in 1 quart boiling water add vanilla and flavoring when cool.”
WIKIPEDIA