1. A method of measuring registration in a multicolor marking platform comprising the following steps: a) marking a first region of a test pattern and a second region of a test pattern on an image receiving member using a black marking material representing a black color separation and a non-black color marking material representing a non-black color separation; b) illuminating the first region with a light source and detecting the reflected light rays; c) illuminating the second region with the light source and detecting the reflected light rays; and, d) determining the registration between the non-black color separation and the black color separation by comparing the light rays reflected by the first region to the light rays reflected by the second region.