Process for the production of masked positive color images by the silver dye bleach process using silver complex diffusion
US4046566A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Oct 23, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a process for the production of masked subtractive positive color images in accordance with the silver dye bleach process. In the material to be processed PA1 A. a silver halide emulsion layer consisting at least partially of silver iodide is allocated to the dyestuff, of which the undesired parasitic color density is to be compensated, PA1 B. in a further layer, at least one second dyestuff, of which the main color density corresponds to a parasitic color density, requiring compensation, of the first dyestuff, and a silver halide emulsion free from iodide ions, are present, PA1 C. a further layer, which is adjacent to that containing the second dyestuff, contains colloidal nuclei which are capable of depositing metallic silver from soluble silver complexes, PA1 D. a separating layer is present between the layer containing the nuclei and the dyestuff layer, of which the parasitic color density is to be compensated. The silver developer bath, with which the material is treated contains a ligand, which is able to produce water-soluble silver complexes which are capable of diffusion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.