There’s history all around you. Even in the grocery aisles. Here’s one:
While most plastic bottles of Coca-Cola boast a red cap that matches their usual color scheme, in the spring you may notice bottles with yellow caps appearing on shelves. That yellow cap signifies that the drink is kosher for the Jewish holiday of Passover.
Prior to 1935, Coke wasn’t kosher at all, but that year the company swapped out beef-tallow glycerin for a vegetable counterpart that
made the drinks both kosher and vegan. In 1980, however, Coke began using high fructose corn syrup instead of cane sugar, making the beverage non-kosher for Passover according to Jewish dietary laws.
In order to remedy the situation, Coca-Cola now produces a special yellow-capped bottle each year that signifies the high fructose corn syrup has been swapped out for a sucrose sugar substitute, thus making this version of Coke kosher for Passover.
Sources: The Daily Meal , Business Insider, The Kitchn
The Historical Society of Sarasota County 
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