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Why Do Some Coca-Cola Bottles Have Yellow Caps?
Once a year, Coca-Cola releases bottles topped with yellow caps to signify that the product is Kosher for Passover. That means instead of using high-fructose corn syrup, which is forbidden for those who observe, the brand uses real cane sugar — essentially mimicking the formulation for the much-prized Mexican Coke.
Source: foodandwine.com