Method for marking of single pane safety glass

The invention relates to a method for marking single pane security glass, produced from single pane glass by a heat treatment said single pane glass (1) being provided with at least one metal-particle- or metal-ion- containing marking, generated by laser irradiation (3) of a metal ion donor material (2) arranged on the single pane glass, said single pane glass (1) being subjected to a heat treatment to form single pane security glass (1) wherein at least one marking is altered by the heat treatment and it may be checked whether a change to at least one marking has occurred and thus the heat treatment may be verified.