I have a backdrop setup, and I have been using a roll of seamless black paper. However for video, the black is not deep and dark enough for me. I need a deep black backdrop by next Monday, and no stores around me seem to carry black Muslin. I am likely going to go to the fabric store and get black cloth of some kind. What is the best fabric to use? Also, using 3 lights / softboxes (continuous) what is the best way to light a single subject with the backdrop relaining as dark and black as possible?