Photographic Process
A process that allows obtaining images by an optical device on a light-sensitive film and transferring them to photographic paper by chemical means. Photographic paper is covered with a photosensitive emulsion containing silver bromide crystals that are less than 0.001 mm in size. After chemical treatment, sediments of tiny silver particles are formed in the areas of the emulsion that have been exposed to light. These fragments become blurred and nontransparent. The areas that have not been exposed to light become clear and transparent.
Special features of the obtained image:
- irregular structure in the form of chaotically arranged clouds of tiny spots;
- gradual change of color, no raster.
a
b
c
Fig. 1. Belarus. Passport issued in 1997:
a — data page. Paper substrate; b — the same. The photo is glued to the data page; c — the same. Zoomed fragment. Gradual change of color, no raster