Developing solvent for layers which are crosslinkable by photopolymerization and process for the production of relief forms

A process for preparing a flexographic printing plate which comprises the steps of imagewise exposing to actinic light, layers which are crosslinkable by photopolymerization, said layers comprising a binder based on an elastomeric polymer, a photopolymerizable monomer compatible therewith and a photoinitiator, and washing off the non-crosslinked portions of said layers with a developing solvent, consisting essentially of in admixture (a) about 55 to 90% by weight of at least one aromatic compound of the general formula I ##STR3## wherein R.sup.1 to R.sup.4 are the same or different and denote hydrogen, (C.sub.1 -C.sub.5)n-alkyl or iso-alkyl and R.sup.1 and R.sup.2, provided that if said R.sup.1 and R.sup.2 are directly adjacent, they may also form a cycloaliphatic or aromatic ring having 5 or 6 carbon atoms as ring members which are non-substituted or substituted with methyl,

• provided that the sum of carbon atoms of all substituents and ring members is from 9 to 13, and (b) an alcohol having a boiling point at least as high as the boiling point of butanol.