What is the photosensitive material for wet printing photography?

Gelatin is a natural protein compound with good photosensitivity. In the process of wet plate photography, the photographer will coat gelatin on glass or metal plate, and realize photoelectric effect and chemical reaction through the interaction between light passing through gelatin layer and silver halide particles. The image information formed by light can be recorded by gelatin and converted into visible images in the subsequent development and fixing processes. Gelatin, as a photosensitive material, has high resolution and sensitivity in wet printing, which can capture images with rich details and provide photographers with more creative opportunities.