Quote Originally Posted by cliveh View Post
Black velvet has something like a 99.9% absorption of light and as such is a great background.
Unless of course you need a white background, per the OP!

Though I do keep yards & yards of black felt around. Very inexpensive so I don't mind, say, cutting a hole in it or tearing a strip off. It's sort of like velcro where lint is concerned, but it's lightweight and blocks a lot of light - really handy for negative fill, killing a window, etc. You can tape it up with painter's tape and it actually stays put! I buy it by the yard on line.