So when I first got my camera I played with its black and white mode. These photos show how the red and green "filters" work. Let's start with the original black and white.
No photoshop, these are all direct from the camera.
So this second one is with the green filter turned on. So we get to see all the red orange text on the trailer. And the cab becomes paler. (Come on, we all remember this one from about 40 years ago, we all wanted it).
The third picture is with the red filter on, all the reds pale away. The red filter also makes the green darker, almost black.
For those of you who don't remember this Matchbox classic, here is the original.