High contrast by imagewise iodide infection in a mixed silver ha

Details High contrast by imagewise iodide infection in a mixed silver ha High contrast by imagewise iodide infection in a mixed silver ha

1980-02-19

1982-06-15

Louie, Won

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Developing

430949, 430564, 430599, 430567, G03C 184, G03C 524

Patent

active

043351999

ABSTRACT:
High contrast photographic images suitable for lithographic use are obtained with stable (nonlithographic) developers when iodide is released from a surface-sensitized iodobromide emulsion to induce development of the exposed areas in an internally sensitized core-shell emulsion. A bromoiodide or trihalide core is produced by balanced double jet precipitation, then the core is chemically sensitized and covered with a chlorobromide or chloride shell by balanced double jet precipitation or preferably by a cyclic pAg addition technique. The core-shell emulsion must have a sensitivity equal to or greater than the surface sensitized emulsion.

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patent: 3598597 (1971-08-01), Farren et al.
patent: 3695881 (1972-10-01), Luckey
patent: 3761276 (1973-09-01), Evans
patent: 4035185 (1977-07-01), Evans et al

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