Introduction of Silver Plating in Daguerre

Daguerre photography, also known as silver plate photography, is recognized as the origin of photography. 1839 was invented by Daguerre. The photosensitive film of silver iodide is formed on the surface of the polished silver plate. After exposure for 30 minutes, it was sublimated by mercury and developed into a positive image. Gail method may be recognized as the inventor of photography. At that time, the exposure time of this photography method was about 30 minutes, which was much shorter than Nieps's solar hardening photography method. The photos taken by this method have the characteristics of thin shadow line, uniform tone, good fastness, unrepeatable and opposite images. This method of photography is named after the silver plate photography, so it is also called the silver plate photography.