Transfer powder marking method using a core-shell powder comprising a pigment, solvent-insoluble polyester resin and a volatile halogenated hydrocarbon insoluble ingredient

In a marking process which comprises transfer of a pattern of a powder of a marking agent across a wide air gap between a metal member to be marked in a marking pattern and an image-holding member and solvent-fixing said powder, the improvement wherein said powder has a particle diameter of about 20 to 200 .mu.m and comprises a pigment, a fixing solvent-soluble polyester resin, and from 15 to 70% by volume of the marking agent of a volatile halogenated hydrocarbon-insoluble ingredient, wherein said powder comprises a core and a shell portion wherein said core consists of said volatile halogenated hydrocarbon-insoluble ingredient.