Method of reproducing color highlighted documents

A method of reproducing a color highlighted original document, including the steps of:

• charging a photoconductive surface having an electrically insulating overcoating to a substantially uniform level;
• projecting successive single color light images into the charged portion of the photoconductive surface, in superimposed registration with one another, to record a first electrostatic latent image on the overcoated photoconductive surface;
• developing the first latent image recorded on the overcoated photoconductive surface with black particles;
• transferring the black particles from the latent image to a sheet of support material;
• charging the overcoated photoconductive surface to a substantially uniform level having a first polarity;
• projecting a single color light image onto the charged portion of the overcoated photoconductive surface;
• charging the portion of the overcoated photoconductive surface having the single color light image projected thereon to a substantially uniform level having a second polarity opposite to the charge of the first polarity;
• projecting a light image of the original document onto the charged portion of the overcoated photoconductive surface;
• applying an alternating charge to the portion of the overcoated photoconductive surface having the light image of the original document projected thereon;
• illuminating uniformly the overcoated photoconductive surface to record a second electrostatic latent image corresponding to one of the colored regions of the original document;
• developing the second latent image recorded on the overcoated photoconductive surface with particles corresponding in color to the color of the single color light image;
• and
• transferring the colored particles to the sheet of support material having the black particles thereon.