Direct positive image forming method comprising developing with a combination of nucleating agents
US4968592A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1988 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Sep 30, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/141
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A direct positive image forming method comprising development processing an imagewise exposed photographic light-sensitive material comprising a support having thereon at least on photographic emulsion layer containing internal latent image type silver halide grains not having been previously fogged in the presence of a nucleating agent, wherein the nucleating agent comprises at least two kinds of nucleating agents and a ratio of nucleating rates thereof is at least 2.0. In accordance with the method of the present invention, images having both a low minimum density and an extremely high maximum density can be rapidly and stably obtained using a small amount of nucleating agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.