Wouldn’t a pitch black room achieve the same effect with much less cost/effort? As far as I know the idea of these compounds is to absorb light, but if you get rid of light to begin with then you don’t need them?
You don’t experience black in absolute darkness, more of a very dark static-like fizzling grey. In order to experience the deepest black, you need to contrast it with something lighter.
There's a single bare lightbulb suspended out of reach in the void. The walls feel like ScotchBrite though you can't see them. You aren't wearing any clothes. The room begins to rotate slowly as if it were a large tumble drier, rolling you off your feet. The walls gradually turn red.
It's really not that bad. Some people find it unsettling, but many find it kind of relaxing. Derek from Veritasium has a good video on it for the interested.