I am looking for a command that when triggered will change the view color ingame to black and white for a new puzzle idea.

Idk if there is a command that will do this but if so it will help out a ton.

Give this link a look

To clarify: there used to be a simpler way (the mat_yuv convar) but that doesn't work in Portal 2. The best way I've found is to use color correction, which is how I did the black-and-white effect here.