Dechlorane
From PyroGuide
Formula: C10Cl12
Description: Sold under the name Mirex, was used as a insecticide until banned. It can be used as an exotic Chlorine donor, which while effective, has been banned in fireworks by many authorities due to the toxicity.
Hazards: Prolonged and repeated exposure to Mirex can result in damage to the liver and it can enter the body via inhalation, ingestion, and absorption via skin. Any contact should be avoided and appropriate safety precautions should be taken.
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