I received this today. It's supposed to be the blackest black acrylic paint absorbing 99.4% of visible light.
We will see how it looks on a two tone model car. I'm thinking lime green accented with this black.
I tried a spot on the inside of a fuselage that won't be visible and it is a very deep black. I think it would disappear up against black background. I may test that and share results.