In my former shop we once got a maroon fabric that bleed hugely....thankfully we seemed to catch it before a customer brought it to our attention. I pulled the bolt from the floor, went home with a couple of yards of it and washed it twice. It was still bleeding like a severed artery.
Then I washed it with some nice prewashed white fabric, on purpose, which came out the most adorable baby pink color! We decided to use the rest of the bolt to do that, dye a bunch of fabric for all the staff and a few 'special' customers who we knew wouldn't come back to bite us. It was some of the prettiest fabric I've ever had, especially knowing that it came from the evil maroon that had cheated us all!
Jan in VA