What are the Nature and Composition of Photosensitive Emulsions?

Photosensitive emulsion refers to a kind of paint with photosensitive properties, usually composed of silver bromide and gelatin, in which silver bromide plays the main role of photosensitive. Gelatin acts as a carrier and enhances photosensitivity. The photosensitive emulsion is applied to the film base to become a photosensitive film. When applied to special paper, it becomes photo paper.

Photosensitive Emulsions

Nature and composition

The photosensitive emulsion is a creamy yellow viscous liquid at room temperature, and it condenses into a jelly when the temperature drops to about 10°C. Silver halide crystallites are photosensitive materials in photosensitive emulsions, with an average diameter of only about 1 μm. Its shape can be cube or octahedron, or have various irregular shapes. Practical silver halide crystallites are often various mixed crystals. For example: a mixed crystal of silver chloride and silver bromide, or a silver bromide crystal doped with a small amount of silver iodide, etc. This mixed crystal can make the photosensitive emulsion have the required photosensitive properties. The gelatin in the photosensitive emulsion disperses the silver halide crystallites uniformly and gives the silver halide crystallites the necessary photosensitive properties. A series of new processes for strictly controlling the structure of silver halide crystals have been developed, and some silver halide crystals with special structures have been successfully developed. For example, flake particles, also called T particles and double-layer structure particles, make the sensitivity of the color film reach the level of ISO1000 to 1600.

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