Patent ID: 8652740

Claim:
A printing method comprising the steps of: forming at least one first toner image by charging a primary imaging member to have an image modulated difference of potential of a first polarity between a higher difference of potential and a lower difference of potential relative to a ground at individual engine pixel locations on the primary imaging member where toner is to be developed, and to have an image modulated difference of potential above the higher difference of potential at the individual engine pixel locations on the primary imaging member where no toner is to be developed; establishing a first development difference of potential of the first polarity between the higher difference of potential and the lower difference of potential at a first development station to form a first net development difference of potential between the first development station and the individual engine pixel locations on the primary imaging member, with the first net development difference of potential being the first development difference of potential less any image modulated difference of potential at the individual engine pixel location; and positioning a first toner charged at the first polarity at the first development station such that the first toner is electrostatically urged to deposit in the individual engine pixel locations according to the first net development difference of potential for the individual engine pixel locations; transferring the at least one first toner image and a second toner image in registration to form a composite toner image on a receiver; creating a second net development difference of potential of the first polarity between a second development station, a bias member and the first toner at each location on the receiver used for printing, with the second net development difference of potential being a second development difference of potential between the second development station and the bias member less any difference of potential relative to ground of any first toner at the locations on the receiver; and providing a second toner of the first polarity at the second development station such that the second toner is electrostatically urged to deposit at individual locations on the receiver in amounts according to the second net development difference of potential at the individual locations; wherein the second development difference of potential is set at a level such that second toner is deposited on the receiver to cause a total amount of first toner and any second toner deposited at each location on the receiver to be maintained within a range that is less than a range of first toner amounts on the receiver.