Silver bromide

Silver bromide (AgBr) is a pale yellow ionic compound that darkens when exposed to light. Its photosensitivity made it a key light-sensitive material in photographic emulsions.

Photographic emulsion: A suspension of light-sensitive silver halide crystals in gelatin, coated onto a support. Silver bromide crystals dispersed in gelatin form the light-sensitive layer of many photographic materials.
Black-and-white photography: Photography that records images chiefly through variations in brightness rather than color. Silver bromide emulsions are a classic means of recording monochrome images.
Silver: A chemical element with symbol Ag and atomic number 47, valued for its conductivity and reflectivity. Silver ions in silver bromide are reduced to metallic silver during image development.
Louis Daguerre: A French artist and inventor who developed the daguerreotype photographic process. Daguerre's early photographic process used silver halides, including silver bromide in later refinements.
Darkroom: A light-controlled room used to handle and process light-sensitive photographic materials. Unexposed silver bromide materials must be protected from light during loading and processing.
Latent image: An invisible change in a photographic emulsion produced by exposure to light and revealed by development. Exposure creates silver-containing image centers within silver bromide grains before any visible image appears.
Photographic film: A flexible transparent support coated with light-sensitive emulsion for recording photographic images. Many film emulsions use silver bromide grains to capture exposure.
Bromine: A reddish-brown halogen element with symbol Br and atomic number 35. Bromide ions are the halide component of silver bromide.
John Herschel: An English astronomer and chemist who made influential contributions to early photography. Herschel investigated silver compounds and introduced fixing methods that helped make photographs permanent.
Fixing (photography): The photographic process that removes undeveloped light-sensitive silver halide from an image-bearing material. Fixer dissolves unexposed silver bromide, preventing later light exposure from darkening the image.

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