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Tetramethyl lead is a flammable, colourless liquid with a slightly sweet odour. Tetramethyl lead is insoluble in water but is soluble in most organic solvents, alcohol, benzene, and petroleum ether. Tetramethyl lead is incompatible with tetrachloro trifluoromethyl phosphorus, strong oxidisers, sulphuryl chloride, and potassium permanganate. Tetramethyl lead on hazardous decomposition releases toxic gases and particulates, such as lead fumes and carbon monoxide. It may cause fires and explosions. The commercial product is often dyed red, orange, or blue. Tetramethyl lead is frequently mixed with smaller amounts of ethylene dibromide, ethylene dichloride, dyes, kerosene, stabilisers, and inert substances.