Method of forming a high-contrast photographic image
US4272606A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1980 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Feb 1, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/15
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of forming an extremely high-contrast negative photographic image which comprises image-wise exposing a photographic light-sensitive material comprising a support having thereon a mono-disperse silver halide emulsion layer containing surface latent image type silver halide grains and also containing a compound represented by the following general formula (1): EQU R.sup.1 NHNHCOR.sup.2 (I) wherein R.sup.1 represents an aryl group, R.sup.2 represents a hydrogen atom, a phenyl group or an unsubstituted alkyl group having 1 to 3 carbon atoms, and then processing the exposed light-sensitive material in the presence of a compound having a thioamido moiety in the molecule thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.