So, first, you can have my four Einsteins...when you pry them from my cold, dead hands.
That out of the way, since the topic has shifted to wall color...you actually want both black and white, often at the same time.
My solution was to paint the walls white and make a bunch of black velvet drapes, including ones I can stretch across the ceiling. With one each black and white Savage vinyl backdrop the same dimensions as the floor, I can turn the room into a black box, a white box, or any combination of either. In a 50' cube of a studio, you don't have to worry about undesired bounce. In your typical suburban home, if you want to control bounce, your only choice is something like what I've done.
In a similar vein...your local home improvement store will sell inexpensive solid styrofoam insulation in 4' x 8' sheets. One side will be flat neutral white (with a clear plastic protective coating with writing designed to be peeled off and discarded) and the other side will be silvered. These make for awesome monster-sized reflectors! You can also paint the white side black (the things are dirt cheap, so get as many as you need) and you've now got an impromptu room divider / giant barn door / whatever. With a bit of tape, you can turn them into v-flats and paint them any color you like. You can also peel off the silvered side if you want white and black or black and black (or white and white or whatever). Also look for 2' x 4' sheets of the same stuff in the same section, both sizes in practically any thickness you could want. All of these you can cut down however you like with just a utility knife.