pyrotechnics-revived/chapters/99-1-chemical-mercury-chlor...

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## Mercury chloride
**Formula**
$Hg2Cl2$
**Pyrotechnics use**
Chlorine donor
**Synonyms**
Calomel, Mercurous chloride.
**Description**
Mercury(I)chloride is a dense yellowish-white solid that was once used as a chlorine donor for enriching colour, but owing to it's high toxicity and relatively low chlorine content (15%) when compared to the likes of polyvinyl chloride and parlon, it hasn't been widely used in around 40 years.
**Sources**
TBD
**Hazards**
Xn
Mercury(I)chloride is toxic and precautions should be taken to minimise exposure by any route.