I once encountered an antique store absolutely crammed with flammables, cloth, paper, etc., There was also a dresser drawer filled to the brim with flash powder, flash compound, flash sheets (which long ago I used myself) and flash ribbon. Shudder, shudder.
During WWII there were some four engine bombers with bomb bays full of capacitors that took from England to Germany to charge up so that a flash picture of an entire city could be made. A simpler approach to the same intent was to drop a bomb casing filled with magnesium powder.
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