Phosphate soda is a type of beverage that has a tangy or sour taste. These beverages became popular among children in the 1870s in the United States. Phosphate beverages were made with fruit flavorings, egg,

malt Malt is germinated cereal grain that has been dried in a process known as " malting". The grain is made to germinate by soaking in water and is then halted from germinating further by drying with hot air. Malted grain is used to make beer, w ...

, or wine. In the 1900s, the beverages became popular, and fruit-flavoured phosphate sodas were served at

soda fountain A soda fountain is a device that dispenses carbonated soft drinks, called fountain drinks. They can be found in restaurants, concession stands and other locations such as convenience stores. The device combines flavored syrup or syrup concentra ...

s, before losing popularity to ice cream based treats in the 1930s.

Phosphoric acid Phosphoric acid (orthophosphoric acid, monophosphoric acid or phosphoric(V) acid) is a colorless, odorless phosphorus-containing solid, and inorganic compound with the chemical formula . It is commonly encountered as an 85% aqueous solution, w ...

is used in many bottled soft drinks, including

Coca-Cola Coca-Cola, or Coke, is a carbonated soft drink manufactured by the Coca-Cola Company. Originally marketed as a temperance bar, temperance drink and intended as a patent medicine, it was invented in the late 19th century by John Stith Pembe ...

. 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 to 3, the same as freshly squeezed lime juice. Horsford used

bone ash Bone ash is a white material produced by the calcination of bones. Typical bone ash consists of about 55.82% calcium oxide, 42.39% phosphorus pentoxide, and 1.79% water. The exact composition of these compounds varies depending upon the type of bo ...

, which is mostly calcium phosphate. In the 21st Century, bone ash is used primarily in the ceramics industry, and is rarely available as food grade stock. The ingredients can, however, be synthesized from modern food-grade chemicals.

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