Hmm.. I'm trying to clear this dilemma in my head. So,using the liquid emulsion as a glass-plate negative with variable contrast properties,you might be able to alter it using appropriate filter. you could basically contol the contrast. But if you introduce the red sensitization, you interfere with the blue/green emulsion sensitization? Would there be filter combination to combine these 3 in the "same level" of contrast.. Hmm..
I have understood that then you are dealing with variable grade paper, there are multiple layers of color sensitive emulsion (blue and green) on top of each other. Wondering how do they combine them and keep them in harmony using it in liquid form without interfering each other.. Must be the infusion of sensitizing dye in the silver molecule before they are mixed together.