 The advantage of alkyl aluminium and similar compounds is the high content of carbon and hydrogen, resulting in bright emission lines similar to spectral signature of burning jet fuel.Controlled content of solid combustion products, generating continuous black-body radiation, allows further matching of emission characteristics to the net infrared emissions of fuel exhaust and hot engine components.The flames of pyrophoric fuels can also reach the size of several metres, in comparison with about less than one metre flame of MTV flares.