Printing system

A xerographic system comprising:

• a plurality of marking devices for applying images to print media;
• a fusing device associated with each of the marking devices for applying a primary fusing treatment to the applied images exiting the marking devices;
• a secondary fusing device which selectively receives printed media from the marking devices and which applies a further fusing treatment to the applied images thereon;
• a print media transportation system which links the first marking devices with the first and second secondary fusing devices;
• and
• a control system which selectively routes printed media from the first marking engine and the second marking engine to the secondary fusing device when at least one of the following determinations has been made:
• (a) printed media from at least one of the first and second marking engines has an appearance characteristic which is below a predetermined minimum value;
• (b) printed media from one of the first and second marking engines has an appearance characteristic which does not meet a predetermined level of consistency with an appearance characteristic of printed media from the other of the first and second marking engines.