bleached fabric; dispersal

Black cotton folded and Domestos bleach dripped onto the folds. I left it a few days, until I could see the fabric lighten. Rinsed it out quickly so the bleach didn't rot the fabric, and create holes.....though that could turn out to be a happy accident? Next time?
The fabric really is black; the second photo shows a more true colour.

I pinned it onto the cotton/linen mix fabric that I'd dyed using black bean water. It's a bit too heavy, so I'm experimenting with different ones. I'm stitching that seed stitch I'm so taken with. The next thing really is to get the right fabric to attach to it. Then I can stitch away to my heart's content........is one's heart ever content?