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When heated, irritant formaldehyde gas evolved from solution. The main products of decomposition are carbon monoxide and hydrogen. Metals such as platinum, copper, chromia, and alumina also catalyze the formation of methanol, methylformate, formic acid, carbon dioxide, and methane.
Another toxic gas used in chemical suicides is hydrogen cyanide, though it is not as common because the consumer products needed for the reaction are less readily available. Hydrogen cyanide gas is created using an acid source and cyanide salts such as sodium cyanide or potassium cyanide.