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High Amplification Cobalt Imaging System

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A novel high gain photothermographic imaging process is described. The essential components consist of a CoIII amine, a redox transfer ligand L and a light-sensitive element capable of producing centers of CoII. On exposure, a reducing agent is produced, commonly via a quinone which photogenerates a hydroquinone. On heating, the hydroquinone reduces CoIII amine to produce CoII. The ligand then complexes this CoII to form CoII Ln, which, in turn reduces more CoIII amine. The resulting reaction produces a metallized dye, CoIII Ln, amine and more CoII, which in the presence of excess L continues the cycle, giving photographically useful amplification. The system is capable of speed several thousand times that of an efficient one-quantum process.

Affiliations: 1: Printing Plate Product and Technology Development Eastman Kodak Company Windsor, Colorado U.S.A., 80551


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