By the 1990s, Coca-Cola and Pepsi were both about a century old, and they'd convinced the public that cola drinks had to be brown. Crystal Pepsi, however, was clear.

Coca-Cola Co., Conagra, General Mills, Kellanova, Kraft Heinz, Mars, Mondelez, Nestle USA, PepsiCo, Post Foods and WK Kellogg ...