What do silver photography and wet photography mean? Ask for advice from seniors.

The earliest practical photography technology was1silver disk photography invented in the 1930s. The thin copper plate is polished and plated with a layer of pure silver, which makes it sensitive to light after reacting with iodine or bromine vapor. Then put the copper plate into the camera, expose it according to the light reflected by the object when shooting, develop it with mercury vapor, and fix it with sodium thiosulfate solution. The copper plate itself became a positive film without a negative. It was invented by Daguerre, a Frenchman, and it is also called silver plate photography.

Since then, people have continuously developed various methods, hoping to acquire and save images more easily and conveniently. Until 185 1 year, new photography methods appeared. British sculptor Frederick Scott Archer (1813–1857) invented collodion and applied it to related photography, which became a widely used photographic system in the history of photography, also known as "collodion wet printing" process.