Calcium Carbonate (Natural Type)

21 CFR 73.1070
E 170
CAS: 471-34-1
21 CFR 184.1191 (GRAS)

calcium carbonateCalcium Carbonate is a white powder found in nature in mineral sources such as calcite, limestone and marble. Pharmaceutical companies use calcium carbonate to colour tablet coatings. In addition, calcium carbonate also provides dietary calcium.

Colouring with Calcium Carbonate

Calcium carbonate adds colour to foods and firming properties to vegetables. Calcium carbonate is insoluble in water but may be emulsified to disperse in water. While sourced in nature, calcium carbonate is a stable food colouring and does not require any special processing to preserve its colouring properties. It may be produced by the precipitation of calcium ions with carbonate ions. The European Union (EU) has approved calcium carbonate as a food colouring. Some other regions do not allow its use as a colour additive.

calcium carbonate chemical structure
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