I'll get into the details why I need this for below but first I'll explain what I'm looking for. I basically need a flat sheet of aluminum or any plastic in grey or black color that doesn't provide specular reflections, yet is smooth enough to not have any noticeable texture when looking with the naked eye from the closest possible distance. I've checked some catalogues for banners, video projection screens, matte plexiglass and matte aluminum, sandblasted glass and acrylic and the off-the-shelf ones I've seen so far have a pretty noticeable texture from up close. I've also gotten some silver nano sized particle powder but haven't managed to succuessfully evenly adhere it to a surface. Haven't been able to test etching yet as well. The reason I need as smooth as possible is I am building a stereoscope ( https://en.wikipedia.org/wiki/Stereoscope ) but the images projected by a pico projector rather than printed on the screen. This poses a problem as any texture on the screen becomes much more noticeable, more than when looking from very close distance. However if I use a specular screen such as smooth plastic or metal then the issue is the lens of the projector becomes visible as well which even though is AR coated still has some of the projected light scattering inside it or projecting on it as well so a very visible glare is seen with the projected image. So I think a specular screen is out of the question. With diffuse screens though the off-the-shelf screen materials I've tested so far are too textury. Any ideas what I can use given this info? PS. I am aware of VR headsets, I'm working on something different for which HMDs aren't suitable.