What did you spray when you took pictures before liberation?

This is a flash of light. /kloc-The burning magnesium powder invented in Germany more than 0/00 years ago, as long as you keep burning magnesium powder, it can always flash, just like setting off fireworks, and it can also be said to be the oldest incendiary bomb. Magnesium combustion can give off dazzling white light, which is easy to ignite. The earliest camera flash was a cover held in your hand, in which magnesium powder was put, and then the shutter was pressed after ignition. The development of flash has gone through: magnesium powder flash-flash bulb-electronic flash. ———————————————————————————————————————————————————————————————————————— Flash photography is after the birth of photography technology. 2. Flash (flash bulb). Invented by German J Ostermeyer in 1929. 3. Electronic flash. Invented in 193 1 year and sold in 1939, using the principle of gas discharge. Its characteristics are fast, economical and convenient. ————————————————————————————