Phosphate soda is a type of beverage that gives a tangy or sour taste. These beverages became popular among men in the 1870s in the United States, and phosphate beverages were made with fruit flavorings, egg, malt, or wine. In the 1900s, the beverages became popular with both genders, and fruit-flavoured phosphate sodas were served at soda fountains, before losing popularity to ice cream beverages in the 1930s. Phosphoric acid is used in many bottled soft drinks, including Coca-Cola, but should not be added directly to drinks because it is too concentrated. The original acid phosphate, made by the Horsford Chemical Company, was a mixture of calcium, magnesium and potassium phosphate salts with a small amount of phosphoric acid producing a liquid mixture with a pH of around 2.0, the same as fresh squeezed lime juice.
- Curtis, Wayne (February 24 2011). "Phosphate With a Twist A long-forgotten soft drink is helping create surprising new cocktails". The Atlantic. Retrieved 17 August 2013.