I ordered 5 meters of unbleached muslin off the internet, and I want to have it sewn up so I can use it easily on my 4x4 frames. I was surprised at how transparent the material actually is, testing it today (with a tungsten 2k fresnel), it seemed like 1 layer barely diffused the beam, 3 seemed to be doing a better job of it. Right now I am contemplating having it done up with double layers, so I can have the 2fold and 4fold effect. How do you folks do it? When you use unbleached muslin, is it merely a single layer? I've attached a pic of the material, though I have to say, it looks less transparent in this picture than it is irl.