28 lines
733 B
Markdown
28 lines
733 B
Markdown
## Calcium carbonate
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**Formula**
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$CaCO3$
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**Pyrotechnic use**
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Colorant
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**Synonyms**
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Precipitated chalk, Limestone, Calcite, Carbonic acid calcium salt.
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**Description**
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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.
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**Sources**
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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.
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**Hazards**
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Xi
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Dust may cause irritation to eyes, skin or respiratory system. Wear gloves, protection goggles and dust mask when manipulating fine powder.
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