(57) An aluminium alloy, a lithographic printing plate support, a lithographic printing plate and a process for producing it are disclosed. The plate support is produced by providing an aluminium alloy material which is comprised of 0.20 to 1.0% Fe, 0.005 to 0.1% of an element selected from the group consisting of Sn, In, Ga and Zn and the remainder being aluminium. The alloy may further contain 0.1 to 2% Cu and/or 0.1 to 0.8% Mg. After providing the aluminium material either or both of its surfaces are sujected to a chemical etching treatment in order to provide a uniform and dense grain structure on the surface forming primary pits in the surface having a particularly defined average size. The surface is then optionally subjected to electrochemical etching treatment in an acidic electrolitic solution in order to provide secondary pits on the surface also having a particu-Jarly defined average size. The support base may be further treated to provide in additional coating thereon or directly coated with a light-sensitive layer in order to provide a light-sensitive lithographic printing plate. By providing the particular alloy material and subjecting it to the disclosed treatment the light-sensitive layer has good adhesion with respect to the support.