Method for printing a plurality of duplicated copies from the same electrostatic charge latent image

An improved method of printing a plurality of duplicated copies with the aid of a single electrostatic charge latent image formed on an electrostatic charge retentive member to form an electrostatic charge latent image corresponding to an image of a document to be duplicated on a charge retentive member and developing the latent image with a developer to form a visible toned image on the charge retentive member;

• transferring the toned image onto an image receiving member;
• fixing the transferred toned image on the image receiving member;
• and successively repeating the developing, transferring and fixing steps for the same and single latent image so as to form a plurality of duplicated copies, the improvement comprising the step of:
• gradually increasing the total amount of the developer supplied to the latent image on the charge retentive member while maintaining the toner concentration substantially constant for developing the latent image in such a manner, that both a large variation in print density at a higher density part in the image and a small variation in print density at a lower density part for successive copies are simultaneously corrected.