Photographic reversal process

US5110715A · kind A · utility

Assignee

• Agfa-Gavaert · BE

Inventors

• Ubbo Wernicke · Hückeswagen, DE
• Werner Berthold · Leverkusen, DE
• Helmut Haseler · Leverkusen, DE
• Gustav Tappe · Leverkusen, DE

Key dates

• Filing date: Oct 10, 1989
• Grant date: May 5, 1992
• Expiry date: Oct 10, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C5/50
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The present invention relates to a photographic reversal process for the production of positive photographic images by imagewise exposure of the photosensitive material containing at least one silver halide emulsion layer, black-and-white first development of the material, chemical fogging or diffuse second exposure and subsequent color development, characterized in that PA0 1. at least one N,N-dialkyl-p-phenylenediamine derivative is used as sole developer in the first development, PA0 2. the first development bath contains at least one compound which prevents the developer oxidation product formed during the first development from reacting with the color couplers present in the color photographic reversal material to form image dyes, PA0 3. the silver halide emulsion layers of the photographic material have a chloride content of at least 80 mol-%, is particularly suitable for the rapid development of reversal materials by elimination of or shortening of the washing step between first and second developer without any disadvantages arising in regard to the quality of the dye images produced by this process.