DD2 does cross-stitch, and has been looking without success for Aida in a soft pastel rainbow tie-dye effect. I can find single-color marbled Aida, but that's not what she is looking for. Like this:
https://www.pinterest.com/pin/722546333937526391/
I've dyed fabric before, but only cotton quilt fabric. Aida is cotton, but my concern is the starch/sizing/ whatever they use to make it stiff. It will have to be washed in hot water to remove it, or the dye won't take.
Will such washing ruin it, do you think? Or should we just bite the bullet and experiment?