Abstract: The present invention provides a correcting liquid for silver imaged lithographic printing plates being an aqueous solution having a pH in the range between 5.5 and 8.5 and comprising a iron (III) complex salt of an organic acid, a sulphite or a metabisulphite, a silver halide solvent and an accelerator, said accelerator being an organic heterocyclic compound having a mercapto- or thione group and not having a hydrophilic substituent besides the said mercapto or thione group characterized in that said accelerator is present in an amount ranging from 0.04 to 0.4 mole per liter of correcting liquid.