Abstract: 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:Hydroquinone: 16.5 gPotassium bromide: 1.7 gSodium salt of EDTA: 1.7 gPotassium metabisulphite: 40 g1-phenyl-5-mercaptotetrazole: 35 gSodium hydroxide and water to make: 1 liter at pH 11.

Abstract: Reduction and gold fogged Lippmann emulsions are described wherein the emulsion is fogged with from 0.07 to 0.5 milliequivalents of reduction fogging agent and from 0.01 to 0.1 millimole of gold fogging agent per mole of silver halide and the emulsion comprises more than 2 g and at most 10 g of electron acceptor(s) per mole of silver halide.

Abstract: A method of developing an exposed lith-type silver halide emulsion is described wherein development takes place in the presence of a sulphonium compound corresponding to the formula: ##STR1## wherein: EACH OF X.sub.1 and X.sub.2 represents an alkyl group at least one of which carries a hydroxy, carboxy, sulpho or cyano group,R represents an alkyl group, an aryl group or the group ##STR2## wherein A is a divalent organic group, or R may represent hydrogen when both X.sub.1 and X.sub.2 are hydroxyalkyl,n is an integer of at least 1 when the compound is a disulphonium compound and is an integer of at least 2 when the compound is a monosulphonium compound, andZ is an anion but does not exist when one of X.sub.1 and X.sub.2 itself contains an anionic group.

Abstract: A process is described of improving the development characteristics of photographic silver halide elements by the use of compounds corresponding to the formula:RO(CH.sub.2 CH.sub.2 O).sub.n (CO).sub.m Awherein:R represents hydrogen, C.sub.1 -C.sub.5 alkyl or (--CO).sub.m --A,n is an integer of at least 4,m is 0 or 1, andA represents, when m is O, sulphoalkyl, carboxyalkyl, or sulphoalkoxycarbonylalkyl, and when m is 1, carboxyalkyl, sulphoalkoxycarbonylalkyl, carboxyalkenyl, sulphoalkoxycarbonylalkenyl, carboxyphenyl, sulphoalkoxycarbonylphenyl or sulphophenyl,The aliphatic hydrocarbon groups having at most 4C-atoms and the carboxyl and sulpho groups being in acid or salt form. The polyethylene glycol derivatives increase developability and sensitivity of black-and-white as well as colour emulsions. They also improve lith-development of photographic "lith"-emulsions.