"BVO, or brominated vegetable oil, has been used as an emulsifying agent since the 1930s to ensure citrus flavoring agents don't float to the top of sodas. Stic

"BVO, or brominated vegetable oil, has been used as an emulsifying agent since the 1930s to ensure citrus flavoring agents don't float to the top of sodas. Sticking a dozen bromine atoms to a triglyceride creates a dense oil that floats evenly throughout water when mixed with less dense fats." BVO was used in some versions of Mountain Dew sodas.