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The spontaneous combustion of phosphine is technically used in Holme's
signals. Containers containing calcium carbide and calcium phosphide are
pierced and thrown in the sea when the gases evolved burn and serve as a
signal. It is also used in smoke screens.
Containers which have a perforated bottom and a hole at the top are filed with calcium phosphide and calcium carbide. These are thrown into the sea. Waterebters the containersthrough the bottom and and reacts to give acetylene and phosphine. Phosphine gets ignited spontaneously as it comes in contact with air and also ignites acetylene. Thus a bright red flame is produced which is accompanied by huge smoke due to the burning of phosphine. This serves as a signal to the approaching ships.
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