chrisnowack is right.
The velvet's nap absorbs far more light than it reflects. That's noted by the degree and type of reflection you can see under such a intense flash. It looks like a miyrid of tiny specks of light, not a overall sheen. And see how much darker the areas are just below the "high points' that are getting the most direct illumination. Those images were also taken at very close range, and although I cannot be exact, you could consider the "lumens" being delivered by the Flash are well in excess of that you'd get from any other light source excepting "Ol Sol" shining directly on the velvet.
So you can go the "Black Velvet" route with the assurance that nothing works better.
Or feels better when a visitor deigns to reach out and cop a feel.
Period. There can be / is only "One". Even the industry standard Flat Black, semi-rough Anodized Aluminum Frames produced by Mfg Screen makers fall way below it's performance. It says a lot that some Screen Mfg. offer a "Deluxe" frame that has a Black Velvet wrapping.
Yes, there are lots of alternatives....some as simple and as low-end as Flat Black paint.
Or Black Felt. (...lots of Lint to see on that stuff....)
But Plush Black Velvet is by far the best, and at under $6.00 a yard, people should "Flock" to the stuff.