Agfa Gevaert Nv

Francois Leon Schelfaut

Herman Adelbert Philippaerts

Willy Joseph Vanassche

Rene Omer Duville

Robert J Pollet

Francis J Sels

Pierre H Nys

Hans Josephus Corluy

Raoul Jan Bortels

A method is described of making reversal images in Lippmann-emulsions wherein the emulsion is image-wise exposed and subjected to a first stage development so that a negative silver image of the original is formed but some silver halide is left in the exposed areas, and then to a second stage development under fogging conditions to develop said residual silver halide in the exposed areas, whereafter the silver developed in said first and second development stages is bleached and the active silver halide then still remaining in the emulsion is converted to form a positive image.

Reversal processing of exposed Lippman-emulsions

A photographic material is described for making positive images by reversal processing, the material comprising a support and a silver halide Lippmann-emulsion layer the average silver halide grain-size of which is less than 100 nm wherein the grains have been chemically sensitized to fog so that a test portion of the emulsion when coated on a support at a coverage of silver halide corresponding to from about 3 g to about 7 g of silver nitrate per sq.m. gives a density between about 0.20 and about 0.70 upon development without exposure for 6 min at 20.degree. C in a developer of the composition:

Lippmann-emulsions and reversal processing thereof

A process for developing photographic silver halide lith-materials in an automatic processing machine with a lith-developer, wherein two replenishers are used, one for compensation of the developer exhaustion resulting from aerial oxidation and a second replenisher serving for the compensation of exhaustion by development.

Processing of photographic silver halide materials

A process is described of improving the development characteristics of photographic silver halide elements by the use of compounds corresponding to the formula:

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St. Niklaas, Belgium

Francois Leon Schelfaut