Emulsion

From Silvergrain Research

For the in-camera negative films and plates, iodobromide emulsion is commonly used. When made conventionally, the crystals are octahedral shape, but when the crystals are made at certain condition, the crystals are flat tabular shaped. The latter is highly useful in providing greater surface area, upon which sensitizing dye adsorbs, and also providing higher image density for the same amount of silver. Therefore, tabular grain emulsions are increasingly preferred for films, since the silver shock in 1980s.

For special application films, such as microfilm, lith film, line film, and other films used for phototypesetters, halide composition varies from silver chlorobromide to iodobromide to chloroiodobromide. Many of these emulsions also contain additives that modify the way the grains are developed by the developer. For example, lith films are often made with 20-30% bromide and the rest chloride. The emulsion

For printing papers, silver chlorobromide emulsions

desalting