Calcium carbonate

Calcium carbonate
Formula: 

CaCO3

Synonyms: 
Precipitated chalk, Limestone, Calcite, Carbonic acid calcium salt
Description: 

Colorless powder. It slowly reacts with NH4ClO4 in presence of moisture. Calcium carbonate is often used in toy fireworks as a cheap substitute for strontium salts, but the flame is reddish orange and not so beautiful as e.g. with SrCO3.

Sources: 

A cheap source is the ceramics supply. Price is about $3/kg for the technical grade. you can also get it easely by powdering clean egg shells.

 

Hazards: 

Dust may cause irritation to eyes, skin or respiratory system. Wear gloves, protection goggles and dust mask when manipulating fine powder.

Compositions containing Calcium carbonate :

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