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The DOT regulation at 49 CFR 174.450 previously stipulated
that when fire occurs in a domestic rail shipment of charcoal in
transit, water should not be used if it is practicable to locate and
remove the burning charcoal. Any charcoal that becomes wet
while a fire is being extinguished must be removed from the car
and not reshipped, and the remaining charcoal must be held
under observation in a dry place for at least 5 days before
forwarding. What is the most likely reason DOT regulates the
domestic transportation of charcoal in this fashion? What
chemical reaction is involved here?

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