A method for preparing a lithographic printing plate comprising the steps
of imagewise exposing, to light, a presensitized plate for use in making a
lithographic printing plate, which comprises a grained and anodized
substrate provided thereon with a photopolymerizable light-sensitive layer
containing a compound having at least one addition-polymerizable
ethylenically unsaturated double bond and a titanocene type initiator; and
then developing the light-exposed presensitized plate using a developer
which comprises a surfactant and a weak acid or a salt thereof having a
dissociation constant pka ranging from 10 to 13, and has a pH value
ranging from 11.5 to 12.8. The method exhibits excellent development
performance, and gives good results to the resultant printing plate in
terms of printing durability and scumming. In addition, the change in pH
value of the developer is so small that the stable development can be
ensured for a long period of time.
