To provide a process for producing a glass plate having an electric conductor pattern excellent in adhesion to the surface of the glass plate, whereby it is not required to have a screen ready for every model and adjustment to desired electric heating performance and antenna performance is easy, and a developer therefor. A developer for electronic printing, characterized in that the ratio of Ftc/Ftp is at least 2.5, where Ftc is the adhesive force acting between one toner particle containing conductive fine particles and one carrier, and Ftp is the adhesive force acting between one toner particle containing conductive fine particles and a photoconductor. A process for producing a glass plate is having an electric conductor pattern, which comprises a step of using such a developer for electronic printing and forming a pattern of a toner on a surface of a glass plate by an electronic printing system, and a step of heating the glass plate having the pattern of the toner formed on its surface, at a predetermined temperature to convert the pattern of the toner to a pattern of an electric conductor.