The fact that "the Coke formula is secret" is a marketing tool itself. I've seen a few ads along the line of "only two guys know the Coke formula and they each only know half." (Which I'm betting isn't true, since that makes Coke a bus factor of one.)
And you can bet that the guy driving in tankers from a orange-oil factory to the coco-cola HQ would have an inkling as to what one of the ingredients is.
