What colour would a magnesium flare burn with
Magnesium cities in World War II, where the only practical civil defense was to smother a burning flare under dry sand to exclude atmosphere from the combustion. Magnesium may also be used as an igniter for thermite, a mixture of aluminium and iron oxide powder that ignites only at a very high temperature. When burning in air, magnesium produces a brilliant-white light that includes strong ultraviolet wavelengths. Magnesium powder (flash powder) was used for subject illumination in the early days of photography. Later, magnesium filament was used in electrically ignited single-use photography flashbulbs. Magnesium powder is used in fireworks and marine
Flare deafening sound. The International Convention for the Safety of Life at Sea (SOLAS) has standards for visual signals, including both handheld and aerial flares. Handheld flares must burn for at least 1 minute at an average luminosity of 15,000 candela, while aerial flares must burn for at least 40 seconds with 30,000 candela average luminosity. Both should burn in a bright red colour. Nations which are members of SOLAS require vessels to carry visual signals on board. Another type of flare is the "fusee", which burns for 10–60 minutes with a bright red light. Fusees are commonly used to indicate