I have used black paint, black felt made for screen boarder, fidelio velvet, joann triple plush and sy fabics triple black velvet. Out of all those the velvets were the darkest with and without light eating nearly all light. Velvet is an interesting material because each one differs beased on which direction the fibers are facing, what veiewing angle you are looking at. Fidelio is the darkest looking straight on, which is why i would recommend it for screen frame, masking and ever surrounding the screen when you are looking directly at it. My SY and Joanns looked darket from the side of the screen, walls and ceiling. When the lights were off, it was all black regardless of how bright the screen got. I stuck with SY since it was the cheapest and looked like s black hole on my ceiling. Anything you do on or around the screen 10 ft out, I would recommend black velvet. If you are building a screen and want the blackest black then you can use Fidelio but it will cost you about $40-50 a yard compared to $9-10 for SY.