Trivia: What does a yellow cap atop a Coca-Cola bottle signify?
Correct Answer: Kosher
So why is this answer correct? : Each year around Passover, Coca-Cola puts out bottles with yellow caps instead of traditional red ones to indicate that the beverages in those bottles are Kosher for the Jewish holiday. While Coca-Cola is certified as Kosher year-round, the high-fructose corn syrup makes traditional Coke undrinkable per the guidelines of what Kosher individuals are allowed to consume on Passover. The yellow-capped bottles contain Coke’s original sucrose recipe, instead.