can use very cheap stoves. Esbit's Safety Data Sheet states combustion can create formaldehyde, ammonia, nitrogen oxide, hydrogen cyanide and ingestion may cause nausea, vomiting, gastrointestinal disturbances, and kidney damage. When burned, the chemical oxidation of the fuel yields noxious fumes, which requires cooking foods in a container, such as a pot or pan, with a tight fitting lid. Burned tablets leave a sticky dark residue on the bottom of pots. If tablets are stored or used under damp conditions they can break up while burning and shed burning fragments, though this claim is hard to verify or reproduce. Hexamine is a precursor for the simplest synthesis of the chemical explosive RDX; in many areas its availability is tightly regulated due to this. See also Metaldehyde Sterno Firelighter References External links Esbit Compagnie GmbH website Fuels Camping equipment Solid fuels