The blackest black paint ever

That is at least as black as the Stewart Filmscreen black velour screen border fabric used here. https://systems.audiogon.com/systems/8367 Plus costs less, and goes on a lot easier. 

The Stewart material is so black the projector can shine right on it and you can't see it, at least not from viewing distance. Makes for a real quality viewing experience. Cool stuff. 

Black for me is a lava tube with the lights out.

It's not just the blackness that matters, but also the degree of lack of reflectivity (sheen). Krylon offers a model named "Ultra Flat Black", catalog no.1602. It's like a black hole! 

look to the deep sea fish if you want to understand black

of course this is science based, not the stuff of faux fantasy