Specific steps of Daguerre photography

The specific steps of silver plating method are as follows:

1. Prepare a copper plate plated with thin silver;

2, cleaning and polishing;

3. Put it into a small box filled with iodine solution or iodine crystal, and iodine vapor reacts with silver to generate silver iodide. The time is 30 minutes.

4. Transfer to the cassette;

5. Put the tapes together in the black box for shooting. The time is 15 ~ 30 minutes. Under the action of light, silver iodide is reduced to metallic silver with different densities according to the intensity of light, forming a "latent image".

6. First develop with mercury vapor.

7. Then put it into concentrated hot salt solution and "fix" it by the action of sodium chloride.

8. Wash and dry.

In this way, an image formed of cream-white amalgam is obtained. The shaded part is transparent, and the dark silver-plated copper plate surface can be seen. It becomes a real picture.