Abstract: A method is described of developing a photographic silver halide element containing developable silver halide by development in the presence of a development accelerator which is a polyaddition compound having recurring units of the following general formula, the recurring units containing at least one thioether sulphur atom linked to two carbon atoms: ##STR1## wherein: Q is --O--, --S--, --S alkylene S-- or --O alkylene O-- wherein the alkylene group may be interrupted by oxygen or sulphur,Each of X.sub.1 and X.sub.2 represents oxygen or sulphur,Alk stands for alkylene which may be interrupted by oxygen or sulphur, andR is hydrogen or COR.sub.1, SO.sub.2 R.sub.1 or CONHR.sub.1 wherein R.sub.1 is an alkyl group or an aryl group andWherein at least one of R, Q, X.sub.1, Alk and X.sub.2 is or comprises a thioether sulphur atom.

Abstract: A recording process, wherein an organic reducing compound being present in a supported or self-supporting layer and corresponding to one of the following general formulae (I) and (II): ##STR1## wherein: R.sub.1 represents hydrogen, an aliphatic group of a cycloaliphatic group, andR.sub.2 represents an aliphatic oxy group, a cycloaliphatic oxy group, an aryloxy group, an amino group of the formula ##STR2## in which R.sub.3 and R.sub.4 (same or different) represent hydrogen, an aliphatic, a cycloaliphatic or an aromatic group or R.sub.3 and R.sub.4 represent together the necessary atoms to close a heterocyclic nitrogen containing nucleus; ##STR3## wherein R.sub.5 represents an aliphatic, cycloaliphatic, aromatic or heterocyclic group, is caused to effect in said layer under the influence of information-wise heating an information-wise reduction of a reducible reaction partner.