Just another thought
If animal's can only see in monochrome (assumably this is black and white monochrome?) then why bother using any color at all in a hunting type camo? Why not just stick with black white and grey? Easier cheaper simpler.
Do ALL animals see only in monochrome, and how did the sceintist's discover that in the first place (I cant imagine taking a bear or something down to specasver's to get there eye's seen to)
What they do is; take the various animals eyes out altogether, open them up and check out the arrangement of cells in the retina known as rods and cones I think there are other factors as well but I dont really know much more about that.
As far as your idea on not using colour in camo, your actually right, if your after most game animals such as deer, elk etc. quite a few North American hunter types use flourescent orange based camouflage, still in a disruptive pattern but extremely brightly coloured so that they can see each other but the animals they are hunting cant.
It's the disruption to the shape of the hunter caused by the camo pattern not the actual colours.( this only works with animals)
regards R.B.