Silver halide light-sensitive material containing tanning developing agent

A process for preparation of a lithographic printing plate comprising the steps in order of:

• imagewise exposing to light a silver halide light-sensitive material comprising a hydrophilic support and a silver halide gelatin emulsion layer, subjecting the silver halide light-sensitive material to tanning development to harden gelatin within an exposed area by using a tanning developing agent represented by the formula (I);
• and removing unhardened gelatin within an unexposed area from the silver halide gelatin emulsion layer to form a relief image of the hardened gelatin on the hydrophilic support;
• in which L is a n-valent linking group selected from the group consisting of a divalent to hexavalent aliphatic group, a divalent to hexavalent aromatic group, a divalent to hexavalent heterocyclic group, —O—, —S—, —CO— , —NH—, —N<, —SO2—, —SO— and a combination thereof, wherein the aliphatic group, the aromatic group and the heterocyclic group may have a substituent group;
• the benzene ring may have a substituent group other than hydroxyl;
• m is 2 or 3;
• and n is an integer of 2 to 6.