Acoustic panel fabric that is pure white and opaque

[soundgun]

Is there such a material?
We've tried several iterations and no matter what we see the Roxul behind it, changing the look from white to grey.
If you have a source in the US that you know can supply something like this, please let me know. We're trying to meet a client's deadline, and we've wasted quite a bit of money on materials already.

[Soundman2020]

What I normally do is to put a thin, cheap, fine weave fabric behind the final finish fabric, to help block the light. I usually use black fabric for that. Surprisingly, even behind white it normally doesn't give you the impression of gray, but you might want to try white as well in your case.

For the final finish fabric, I'd suggest the famous Guilford of Maine: they have a good selection of acoustic fabrics. Not cheap, though.

- Stuart -