Coordination compounds photography

Na[AuClJ, per mole of silver haHde. Coordination compounds are used as emulsion stabilizers, developers, and are formed with the weU-known thiosulfate fixers. Silver haHde diffusion transfer processes and silver image stabilization also make use of coordination phenomena. A number of copper and chromium azo dyes have found use in diffusion transfer systems developed by Polaroid (see Color photography, instant). Coordination compounds are also important in a number of commercial photothermography and electrophotography (qv) appHcations as weU as in the classic iron cyano blueprint images, a number of chromium systems, etc (32). 

Developers -coordination compounds as [COORDINATION COMPOUNDS] (Vol 7) -for photography [PHOTOGRAPHY] (Vol 18) -use m cosmetics [COSMETICS] (Vol 7)... 

Coordination compounds have a wide variety of applications. Complexes of monodentate ligands are used in qualitative analysis, identification of copper(II) and iron(II), dyes [Prussian (TurnbuU s) blue], the cyanotype printing process, the separation of gold and silver from their ores, the purification of nickel, and as fixers in black-and-white photography. 

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