reverse tie dying?

[sldi]

I attempted to dye a muslin a year ago as a backdrop, and I really wasn't pleased with it. The problem was that I was going to do a gray background and used unbleached muslin. The result was a very warm gray instead of the neutral I was going for.

After reading several articles on tie dying, I am wondering if I couldn't use bleach instead of dye, but use the twisting and tie-ing procedures as outlined and bring this fabric back to a mottled look? Of course I know the gray color in it would still be the same warm tone, the original dyeing was not "tie dye" in nature.

[Dobick]

if the color in it is too warm, why not add a bit of bluing to it during the dye process to balance the color a bit back to neutral?