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The flash has given the foreground more illumination than the background. Video demonstration of high speed flash photography. A major purpose of a flash is to illuminate a dark scene. Other uses are capturing quickly moving objects or changing the quality of light. Most current flash units are electronic, having evolved from single-use flashbulbs and flammable powders.
Flash units are commonly built directly into a camera. 1859 showed that burning this metal produced a light with similar qualities to daylight. The potential application to photography inspired Edward Sonstadt to investigate methods of manufacturing magnesium so that it would burn reliably for this use. He applied for patents in 1862 and by 1864 had started the Manchester Magnesium Company with Edward Mellor. It also had the benefit of being a simpler and cheaper process than making round wire.
Mather was also credited with the invention of a holder for the ribbon, which formed a lamp to burn it in. The packaging also implies that the magnesium ribbon was not necessarily broken off before being ignited. A measured amount was put into a pan or trough and ignited by hand, producing a brief brilliant flash of light, along with the smoke and noise that might be expected from such an explosive event. This could be a life-threatening activity, especially if the flash powder was damp. His patent describes a device for igniting photographers’ flash powder by using dry cell batteries to heat a wire fuse.
Variations and alternatives were touted from time to time and a few found a measure of success, especially for amateur use. Flashbulbs have ranged in size from the diminutive AG-1 to the massive No. Manufactured flashbulbs were first produced commercially in Germany in 1929. Such a bulb could only be used once, and was too hot to handle immediately after use, but the confinement of what would otherwise have amounted to a small explosion was an important advance. A later innovation was the coating of flashbulbs with a plastic film to maintain bulb integrity in the event of the glass shattering during the flash.
A blue plastic film was introduced as an option to match the spectral quality of the flash to daylight-balanced colour film. Flashbulbs took longer to reach full brightness and burned for longer than electronic flashes. Its peak light output was around a million lumens. Other flashbulbs in common use were the M-series, M-2, M-3 etc.