Well, assuming that nothing else is wrong with the method, you would still only see a certain relative strength of a certain color. For example, say that you used a strongly red-colored step wedge as a target. So perhaps you might say that an 80% saturated red color does not show a color cross. But isn't it possible that a 30% saturated red MIGHT have a crossover? Or a mix of 30% red and 50% blue, etc? The interactions between film layers are too complicated, I think, to generalize from a small handful of specific color tests.
Originally Posted by Athiril